Tank Turnover

[Elliriyanna]

I am saving for new filters and wanna know how many times an hour a tank should be completely turned over by the filter ... I am looking at a 80 gph filter for my 20 long but wanna be sure thats enough.

[Mentat]

With my ABF I do 10X volume per hour; but that current level could disturb an ACF. It would also depend on filter design you chose. A HOB 100GPH would definitely create a current, while a canister filter with same output can be manipulated and pointed/diffused as desired .

[mpmistr]

4 or 5 times of turnover per hour is best. Most filters are overrated for gph so I would get a 100gph filter if you can because realistically its going to be lower with media.

[Elliriyanna]

Is there a recommended kind of filter? I do love HOBS and canisters are pricey ... So if I do not have to buy a third canister that would be great ( Already saving for two)