canister filter for a 80 gallon tank

[sepehr]

Would a canister that filters 315 gallons per hour be good for a 80 gallon tank? The tank is planted with 40 small tetras & corys and I do a 50% water change every week.

[shrimpNewbie]

for me no, but it really depends on how much maintenance you want to do.
I need to over filter because water changes need to be far in between, so if you want a healthier setup always over filter

[Aquaticfan]

No. Personally I shoot for the 10x amount of flow. At minimum you should do between 5 and 7 x. But thats my opinion.

[Complexity]

The general rule of thumb is 10x tank size. So you'd want to get about 800gph for an 80g tank. Most people accomplish this by putting two filters on a tank.

Obviously, you can get away with less. Tanks with few plants so there's very little obstruction won't need as much filtration. But then tanks with a heavy plant and fish load will want even more filtration. You have to make some judgement based on the tank's characteristics.

But to get some general sense of how much filtration to put on a planted tank, 10x tank size is a good general rule to use.

[Aquaticfan]

Originally Posted by shrimpNewbie

for me no, but it really depends on how much maintenance you want to do.
I need to over filter because water changes need to be far in between, so if you want a healthier setup always over filter

Just cause Im curious.. How does more filtration reduce water changes??? I change water not so much for just solids in the tank but for water conditions. To reduce Nitrates and other things the filters are not removing.