Overflow box

[Francois]

Hello, what eshops overflow box should I buy for a 55 gallon FO with fake corals, with two ten gallon connected to make a 20 gallon sump. I'm hesitating between the 300 gph one, and the 800 gph one.

So which one? I will then buy my pump based on my overflow box.

Thank you everyone

[ToddTT]

Looks like you're near the borderline:

Eshopps: Overflow boxes

For the extra 2" in height, I'd probably go with the 800 model. This will also give you the option to use it on a larger tank in the future.

There is also a link to email eshopps for assistance.

Another possibility, loads of positive reviews:

CPR CS Overflow Boxes