3 HOB filters in a 20 gallon?

[ILLBETHEJUDGE]

HI
I have a 20 gallon tank with 2 aqua-tech 10-20, one in each corner; Would it be to much to put an aqua-tech 5-15 i have laying around?

[thekoimaiden]

What do you have in that tank that needs more than one HOB? The only type of tank that would need that kind of filtration is a goldfish tank, and they shouldn't be in a 20 gal for very long. Unless you are looking to increase the current. In that case just get a powerhead. The only filters really do in an established tank is mechanical filtration. The largest colonies of BB are in the substrate not the filter.

[ILLBETHEJUDGE]

I have one betta, 3 platty, 4 spotted cory and 3 South American Bumblebee Catfish.

[thekoimaiden]

You're not overstocked, and I can't imagine the betta would appreciate the extra current. I would just leave it out. Save it for another tank.

[Olympia]

And save some electricity! :D
Heads up, those catfish can grow to 6 inches, and they can and will eat the betta, cories and platy when they get big enough. :)