I'm currently running 2 emperor 400's on my 55 gal SA chiclid tank and 1 emperor 280 on my 27 gal hex gold fish tank. The gold fish are too dirty for the emperor 280 and i'm finding myself doing twice the amount of maint on the 27 than I am on the 55. I was kicking around the idea of upgrading my filtration systems. What is a good brand of canister filter? Long time ago i had a fluval 303 on a tank and had no problems. Thought about going with Rena XP series or sticking with Marineland.