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466 Posts
Yes power filters are fine. Do as you said and cover the intake with a sponge so the shrimp don't get sucked up. Just wrap the sponge around the intake and attach it with a rubber band or string. People also buy what they call a prefilter. I like to use these as my intake.
http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=3940&N=2004+113424
http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=3940&N=2004+113424