I like my Marineland H.O.T. 250
On my 55 gallon, anytime my water starts looking a little "Dusty" I sit that thing on my tank and fire it up.
About 30 min with that canister on and my water is as clear as air! No Joke!
Wow I never priced those big canisters till now, is that the $430 or the $480 version?
for that price that thing should feed my fish clean my bathroom and wash my dishes too!