03-08-2012, 08:59 PM
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Originally Posted by DKRST
Yea, I'm worried about the "through-flow". That pump has more than 6x the "advertised" flow of my 2215 canister! Even with two intakes, it's still a lot of movement in the tank. I'm not certain I can restrict the outflow enough to please the fishes... Diffusing the outflow is not an issue, an acrylic tube, my drill press, and voila, a tank-long spray-bar. Unfortunately, as Byron said, doesn't really change the total volume of water through the filter of 330 gallons/hour (that's 6.5 tank turnovers per hour). My current Eheim 2215 is rated at 164/hour (3x turnover, but I think that's an over-estimate of flow).
For the named fish, I would never exceed the recommended canister for the tank size. I have Eheims (2) and a Rena (1) on my larger tanks, each is rated for that sized tank. With spray bar, more holes, aiming at the glass...I can minimize the force of the current.