Great info, thanksoldfishguy said:I agree that it depends on what type of fish and how many you plan on keeping. I have a tidal 55 on a 29 gallon and I love it, I also have a Aqueon 300 canister filter on this tank but I have a high fish load and heavily stocked with plants, and CO2. The Tidal 55 is a great filter and should be fine by itself for a average to moderate load of fish. But remember one Oscar or a few goldfish in the tank will produce a lot more waste then 10 neons. But all in all on a 29 it should be fine. I love mine and have a Tidal 75 on my 75 gallon Discus tank along with a canister filter on it and the fish are doing fine.