Best Comprehensive Guide To Set Up A 90 Gallon Fish Tank

Are you looking for a 90 gallon fish tank? But not sure about which one to buy and their best features.

Then you have arrived at the right place.

A 90-gallon fish tank is the best buy for those who want to keep a lot of fish species and give an aesthetic look to the insides. 

In this article, I have enumerated various 90-gallon fish tanks suitable for people according to their needs, followed by a detailed guide for setup and maintain the tank further in future.

There are a lot of tanks available in the market today. Here I am enlisting the best 5 from which you can choose your ideal fit.

Let’s begin with the tanks!


Before going into the tank setup and maintenance, it is of prime importance to understand the one best suited to you.

Each aquarium comes with a different set of features, specifications, advantages, and therefore the right one depends on a variety of factors.

You must take into account all the factors before choosing the right one.

You can turn the aquarium into various types like freshwater, saltwater, tropical as it has a lot of space and keep different fish species without any problem. 



Seapora 59216 Standard Aquarium, 90 Gallon
  • This product is easy to use
  • This product adds a great Value
  • This product is Manufactured in United States
  • The Package Weight Of The Product Is 30.01 Pounds

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API

Seapora is one of the best aquariums in the market right now. It is one of the most reputable brands.

The product dimensions are 30*30*3.4 inches and the corresponding weight is 116 pounds. This aquarium is manufactured in the United States and is available on Amazon at a great price.

Seapora comes with an aquarium divider system which helps create isolated compartments in the tank. It maintains overall heat circulation and filtration and convenient feeding hole with lid.

The aquarium model is available on Amazon at a reasonable price. 


  • LED lighting above the tank
  • Low voltage power adapter
  • Easy to use
  • Available at a reduced price online
  • Manufactured in the United States


Clear-For-Life 90R Rectangle Aquarium - Clear Back
  • Dimensions - 48"(L)x18"(W)x24"(H)
  • Clear Back Panel - Round Front Corners
  • Made in the USA
  • Limited Lifetime Warranty Against Leakage
  • Safer & Stronger than Glass

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API

The Clear For Life is one of the best brands for fish aquariums nowadays. This 90-gallon tank is of the dimensions 48*18*24 inches.

The tank material is acrylic which makes it scratch resistant and gives it a shiny texture. The rectangular shaped tank can house many fish species and the lid is also made up of acrylic.

You can buy it from Amazon at reasonable price. 


  • ABS light fixtures on the top of the tank. 
  • Available at lower price online
  • Tank is made up of acrylic
  • Can accommodate several fish species


Deep Blue Professional ADB18090 90-Gallon Reef Ready Aquarium Tank, 48 by 18 by 24-Inch, Black
  • With Deep Blue Professional you can have the benefit of aquariums and accessories with the features you want at prices you can afford
  • Manufactured by Deep blue professional
  • Made in United States

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API

The aquarium tank measures 48, 18, 24 inches as length,width, and height respectively. The outer body is made up of glass and it is rectangular in shape.

It is reef-ready and already equipped with all the necessary plumbing materials. It is an ideal choice for saltwater fish but is also suitable for freshwater fish types. 


  • Product dimensions: 48*18*24 inches
  • All glass body
  • Rectangular in shape
  • Suitable for both saltwater and freshwater fish species


After buying the right aquarium from the above list, you need to look for the right aquarium stand for support and safety.

There are many aquarium kits available in the market that comes with stand. The stands come in various shapes, sizes, and colors.

Some are pre-equipped with a cabinet, some are water-resistant. To get your hands on the ideal one, you need to make a thorough research.

Below I am listing one of the best 90-gallon aquarium stands.


Marco upright aquarium is a durable support stand for your 90-gallon aquarium tank. The contemporary design and different colors accentuates the aesthetic look of your homes.

It is made up of a dense fiberboard and covered in melamine laminate. The stand supports the aquarium completely and keeps it safe.

The front part conceals all the important equipment like filter, pump. The stand comes with a two two-paneled doors provided to reach the inside accessories without disturbing the whole setup.

You can buy this elegant stand at reduced prices online. 

Some Other Honorable Mentions

SaleBestseller No. 2
B R 20/29-Gallon Paneled Aquarium Fish Stand Storage Cabinet Fish Tank Base and Door Holder Wood Universal Reversible Stand Very Sturdy Black
  • Enjoy the strength and beauty of this 20/29 gallon stand
  • The hinged door on the decorative aquarium stand opens to reveal a storage space for your aquarium cleaning supplies, water treatment items, nets, fish food and any other essential items you have for taking care of your aquatic pets, offering organization that you can depend on
  • Very sturdy and definitely has a clean look
  • Tank Not Included
Bestseller No. 3
BioCube Coralife Size 32 LED Aquarium Reef Package (with New Improved Stand)
  • This REEF PACKAGE combines the Size 32 LED BioCube with the BioCube Stand and BioCube Protein Skimmer along with a BioCube Algae Cleaning Magnet and Coralife Mini Hydrometer
  • The Coralife NEW STYLE Size 32 LED BioCube Aquarium features LED lighting and timer capabilities–taking it to the next level of all-inclusive aquariums
  • Just like older BioCubes, it has a compact and customizable filtration chamber, hinge-top canopy design, quiet submersible pump, dual intakes, adjustable return nozzle and clear glass back panel for easy refugium set-up
  • Compatible with all existing BioCube accessories
  • Included is the NEW AND IMPROVED BIOCUBE STAND. This NEW & IMPROVED VERSION features a solid back panel for added stability. No glue is required.

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API


Apart from the tank and the tank stand, there is a whole list of necessary equipment to be fitting in and out of the aquarium.

The heater comes in various styles. Here I am enlisting 3 most important apparatus to buy for the smooth functioning of the aquarium.

Choose a heater based on the net amount of water available in the aquarium and not the water amount itself. It should be between 3 to 5 watts per gallon of water. 


A 90-gallon aquarium need a heater with power between 270 watts and 450 watts. Most of the models are made with 50 watts increments, therefore, your choice could vary anywhere in between 300 to 500 watts.

The best way to balance is to use 2 heaters that would sum up the upper limit. In this case, 2 250-watt heaters would be an ideal choice.

This helps create a safety valve. That means that if one heater fails, the other one would be there to compensate for the absence.

Moreover, if one gets stuck on, the other one will take a lot of time to overheat making it safe for us to find an alternative in the meantime.

There are 2 types of heaters- hang on tank and submersible. It completely depends on your personal choice or decoration styles.

You can purchase this heater for the tank-

Aqueon Pro Adjustable Heater, 100W
  • Adjustable heat setting 68 to 88°F, Electronic Thermostat accurate to +/- 1°
  • Shatterproof and nearly indestructible
  • Fully submersible; Auto Shut-Off when over-heats, resets when it cools down
  • LED light is always on: red when heating, green when not heating
  • Limited Lifetime warranty

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API


Keeping the aquarium water clean is of prime importance. The filters vary according to the tank quantity and the types of fish kept in it.

It also removes dirt, impurities, fish waste from the tank and creates necessary current. It is difficult to choose from a wide variety of aquarium filters. Some of them includes bio floss, bio sponge, carbon, and other media filters. 

Here are some of the best filters to choose from

Penn Plax Cascade CCF3UL Canister Filter For Large Aquariums and Fish Tanks – Up To 100 Gallons, Filters 265 GPH,Blue
  • CASCADE CANISTER FILTER FOR FRESHWATER OR MARINE ENVIRONMENTS: the Cascade 1000 (CCF3UL) has 3 media baskets, works at 265 GPH, and is recommended for Aquariums up to 100 gallons. It measures 11.5 x 17 x 10 inches.
  • STATE OF THE ART FEATURES OF THE CASCADE 1000: ♦ flow valves that rotate 360 degrees for easy maneuvering in even the tightest aquarium cabinets ♦ large capacity media baskets allow aquarists to customize to their media needs ♦ push button primer allows for a quick and easy prime of the filter ♦ includes a spray bar, tubing, directional spout for customization, and filter medium.
  • USE ANY COMBINATION OF MEDIA: floss pad for removing particulate matter and a course sponge that provides abundant surface for promoting bacterial growth (to remove ammonia and nitrites) included free with purchase
  • SEE BELOW FOR DIAGRAM, THE CASCADE 1000 INCLUDES: ♦ Flow rate control cut-off valves ♦ two independent directional 360 degree rotating valve taps ♦ swimming pool – style hose clamps ♦ quick, easy, push button self-primer ♦ extra-large capacity stackable filter medium containers with lift-up handles ♦ floss pad and coarse sponge included, free with each canister filter ♦ easy lift alignment clamps that release vacuum suction ♦ sturdy tip-proof base
  • FILTER MEDIA OPTIONS BY CASCADE AVAILABLE ON AMAZON, SOLD SEPARATELY: see below for details, sold separately is media such as: bio-floss, bio-sponge, bio-rings, filt-a-pack pro-z, and filt-a-pack pro-carb-z.

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API

Marineland Magniflow Canister Filter For aquariums, Easy Maintenance
  • 3-STAGE FILTRATION: Water flows through media layers to filter water and ensure a clean aquatic environment.
  • VERSATILE: For freshwater and saltwater aquariums.
  • EASY MAINTENANCE: Valve block for quick release to shut down water flow – separates from housing for quick, spill-free maintenance.
  • THREE SIZES AVAILABLE: Comes in 160 GPH, 220 GPH and 360 GPH sizes.

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API

Aquatop CF400UV 4-Stage Canister Filter with UV 9W, 370 gph
  • Includes UV sterilization for crystal clear water
  • Convenient self-priming pump
  • Extremely quiet
  • 3+1 Stage filtration system
  • 370 gals/hr

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API


If you own an aquarium, you might also need a hood. A hood, also known as the canopy is a lid, a plastic or glass barrier that covers the aquarium from the top.

A lot of hoods include lights but not each one. They differ in size according to the size of the aquarium.

Here are two best hoods for your 90-gallon aquariums-

Zoo Med Reptisun Led Uvb Terrarium Hood, 48"
  • 48 inch ReptiSun LED UVB Terrarium Hood
  • Recommended for 48 inch tanks, terrariums, and aquariums
  • Features a highly polished curved reflector for maximum efficiency and UVB penetration
  • Includes 6 lighting modules (6500K, red plant growth, and Blue Lunar LEDs) with one 46 inch T5 UVB bulb
  • This is the ideal light fixture for large terrariums, planted terrariums, and any species that benefits from UVB exposure and bright, visible light

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API

Exo Terra Screen Cover for Hinged Door, 60 Breeder/75 Gallon
  • Hinged screen cover for aquariums and glass tanks
  • Easy to install
  • Maximum UV penetration
  • Central hinges allow easy access
  • Designed for 60 Breeder/75/90/110 X-High gallon aquariums

Last update on 2022-01-16 / Affiliate links / Images from Amazon Product Advertising API


Before adding water, make sure that you have cleaned the aquarium inside-out. Refrain from using any harsh chemicals on the inside of the tank as it could prove to be harmful for the fish.

Also clean the aquarium gravel, rocks, substrate and ornaments with warm water. Now fill the tank with water.

Do not use tap water as it contains chlorine which could be harmful for the fish. Dechlorinate the tap water and then add it.

Some of the best dechlorinators are Seachem Prime, Tetra AquaSafe Plus, Natural Rapport. Do not forget to cycle the tank at regular intervals for necessary bacteria formation which provides nutrients to the fish.

Make sure that the pH level of the water is maintained at a suggested temperature.


Now that you have successfully added the water, it is time to add the fish followed by preferrable decorations.

It is not recommended to add the fish directly as it will not be able to adapt to the changed water temperature and surroundings.

Caution – Even the subtle change in pH level could make the fish sick and lead to death eventually. This process takes patience and careful approach on your part.

Here is a list of some fish types you can keep in a 90-gallon aquarium-

  • Discus and Scalare
  • Cichlids
  • Common tetra species: neon tetras or Rummy-nose tetra
  • Catfish
  • Black lined loach or dwarf loaches
  • Rainbow fish
  • Five Banded barbs, tiger barbs, Odessa barbs
  • Gourami
  • Rasboras
  • Rainbow Snakehead

For reef tank: Tangs, Clowns, Wrasses, Cardinals

Moreover, the fish species to be kept highly depend upon the type of aquarium you are going to make- freshwater, or saltwater.

Even the fish addition should take place according to the. For decorations, you can use different plants, roots, other creatures, rocks, gravel, etc.


This is not the last step in the process. Tank maintenance and management is highly important to ensure the long life of the fish.

Clean and cycle the tank at regular intervals. Feed the fish regularly and keep the lights on and off according to the recommended schedule.

If you have any questions, you can get in touch with us and raise your concerns ranging from the aquarium type to fish type to maintenance tips, anything.

I would also suggest you to spend some time with your water buddies as it increases acquaintance and companionship.


What is the typical size of a 90-gallon aquarium?

The typical 90-gallon aquarium tank dimensions are 48 inches length, 18 inches width and 25 inches height. 

What is the weight of the tank empty and full?

The average weight of the tank when empty is 160 lbs and 1050 lbs when full. 

What fish species can I keep in South America 90-gallon fish tank?

You can introduce 6-8 Discus fish, Agassiz’s dwarf cichlid, cockatoo dwarf cichlid, red striped cichlid, Tefe agassizii or 2-4 pairs of dwarf cichlids in pairs, angelfish, large cichlids, etc.  


[Revised and Updated for July, 2019]
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Written by Debra Hutchinson, founder of FishXperts

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