[fish_4_all]

This is one I will have to agree with! As long as your filters don't turn your fish into 24/7 Olymic swimmers then the more the better. When I get my 20 long I will have both of the AC 20 HOB filters on the tank with one at each end. If I ever get a large tank it will be filtered by an HOB, Canister and whatever I think it needs. If it will fit I will add a filtered powerhead in the same 20 gallon long.

I have AC 20's on my 10 gallons now and it is simply not enough for anything, with or without plants, light medium or heavy bioload. And they are supposed to be for up to a 20 gallon, Maybe with 2 neons and nothing else.

If I had to recommend any one filter, canisters.

 

[fish_4_all]

I can only imagine seeing them chasing around bubbles that are being strewn all over the tank. Might have to designate a section as a flow free zone so they don't go on strike and start to bubble the intakes of the filters so they will air lock. lol

Might be a good topic to start about which fish like a current and which ones don't as well as which ones actually prefer a strong current and which ones thrive in a slower moving almost "dead" flow tank. Just not from me, I wouldn' know where to start.

 

[fish_4_all]

I have never used a sump, and your statement might be accurate but I doubt they are cost effective let alone useful for anything under a 55 gallon. Maybe in a salt tank under that size but not fresh water. Again, this is only an opinion but I can't imagine a sump is a good choice for a 35 gallon let alone a 10.

And yes, if I could afford to set them up on all of my 10 gallon tanks, I would be running small canisters before anything else. Until then, my AC HOB work just fine and possibly provide more than I would expect from a canister designed for a 10 gallon.