4 Top Ranked Super Sleek Hang-on Overflow Boxes

Overflow boxes are available in two distinctive types which are internal and external.

In most of the cases, the internal version is considered as the best option. It is very easy to customize and the best part is that it is very economical as compared to the external version. It can be easily placed inside the tank and you can also cover it with a cabinet. But for doing all these things, your main aquarium tanks should have a drilled hole.

On the other hand, the external version would be a better choice if your aquarium does not come with predrilled holes. Though, you can also drill holes on your own but it’s quite a troublesome task for anyone to do it with utmost perfection.

In addition, if there is not much extra space below your reef tank then also external version would work better. It basically acts as a HOB (hang on back) unit. You can easily hang it at the back and to hide it, use your tank decors such as coral.

Moreover, there is no requirement of a drill as well because they can easily suck the water over the side of tank with the use of siphon. The only disadvantage of this is that sometimes the air enters the siphon and thus water stops draining to the tank. This will eventually lead to the overflow of water as the pump continues to through back water in the aquarium.

Thus it is highly important to check that whether the overflow can draw out air or not.

Thus, it is very easy to keep track of the quantity of water which is inside because an overflow box gives a clear view.

You can accurately decide which HOB overflow box will work great for your aquarium by using many different ways. In most of the cases, the manufacturer gives complete information about the selection of right aquarium size according to overflow box.

Another most important thing that you must consider is the right level of the overflow box flow rate. It should be rated quite higher than the return pump flow rate.

This means you can utilize a 600gph if you own a 500gph return pump. The simple method to make the right selection is to check the exact size of your tank and multiply it by 10. It means if you have a 90-gallon tank then 900gph is optimal.

In other words, it is perfectly fine to use a bigger overflow tank that offers a high flow rate. This is because the overflow can accurately regulate itself and it will also restrict the pumping of excess water than the amount that needs to flow into it.

However, buying a larger overflow box will be quite costly for you as you are paying for greater capacity.