Emperor 400

[Diablos]

Overkill for a 20 gal? 8)

[neilanh]

I think so. Why not the Emporer 280?

[lovemybarbs]

Leave it on low and see.

It's not bad if you want a bigger tank later. I had one on my 29 and I had an easy cycle to my 55 with the same filter.

[Zagz]

As long as it doesn't blow your fish around the tank uncontrollably I'd leave it on the tank.

[Regen311]

I had a biowheel 350 in my 20 gallon tank. upgrading them isn't that much more, and now I'm glad I did. I'm using it now in my 55 gallon. If I had got one that was just big enough, I wouldn't have been able to do that. I wouldn't go insane, but overfiltering, I think (unless you have fish who don't like strong currents, like bettas) isn't a bad idea.

[shumway]

As lovemybarbs said just leave it on low (if option is there?)

It will clean that tank very well and will stop you from having to buy another filter if you upgrade to a larger tank later,I've alway's over filtered my tank's,I have an ac110 on my 55 and my water is crystal clear and i barely ever have to do a big clean on my tank

[physicsdude]

go for it dude. my fav maxim on fish is u cant have enough filtration.

[Diablos]

roger dodger will do!