03-11-2012, 08:43 PM
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You don't mention what fish species are in the tank, or if it is planted; and these two factors should largely determine the filter. So without knowing this, I would suggest a good canister rated to the tank size.
The Fluval 305 is rated for tanks up to 70g so this is fine (unless more filtration is needed, back to the fish/plants question). I've not used Fluval myself, I have Eheim and Rena canisters which according to reviews are rated higher than Fluval. But so is the cost.
On the media/bacteria issue, live plants would negate this concern. And if the tank has been operating for a while, and not new, there will be sufficient bacteria in the substrate and elsewhere. Plus there is the smaller filter.
Last edited by Byron; 03-11-2012 at 08:46 PM..