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I have a 30gal Long with a Fluval 304, rated at 260GPH. I have it cranked at about 3/4 power angled right at the surface on the far side of the tank aiming laterally. On the opposite side of the tank, I still get the protein film. I have a spare Rio 600 which I see is 200 GPH. If I added this pointing the opposite way in the tank, aimed at the surface, would this give me too much water movement? I positioned it and turned it on for a couple of seconds, and it looked like a cyclone in the tank. The sand was still settle, but the detritus in the bottom of the tank kind of swirled. It seemed like it would be a pain in the butt for the fish to swim/sleep in this type of current.
 

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AS long as you have decent rock work and hiding spots there will be plenty of dead spots. My 55g has an eheim 2026 w/spray bar running close to the surface also has 2 maxijet 1200s and a penguin 200 there seems to be no problem with the extra water flow and i never have any detritus build up on the sand. i would say go for it.
 

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Some fish like high currents more than others... what kind of fish do you have?

I have a 125 gal tank with 2,150 gph of (rated) filtration... that's a little over 17x per hour (rated)...

In my opinion the waste not being able to settle on the substrate is my goal for a well filtered tank...
 
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