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The whisper flow might simply have too strong of an output so you could search up a new filter with a flow output that you can adjust or get a sponge filter cover that would slow the water.Tqila said:I have a Betta in a 5 gallon tank which is heated and has a whisper filter in it. The whisper filter absolutely stresses the fish out. When I turn the filter off he is much more calm. I would like to find an alternative filter that may not be so stressful for the little dude. Any suggestions?