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I have a in tank filter and the flow is not adjustable. At the moment I'm using the top of a plastic water bottle (cleaned with hot water, no soap) and have it tied around the filter. It keeps the flow from being so strong that it knocks my betta down when he swims under it. However, I'm worried that keeping that plastic in there could be bad for him. I had to replace it once before because something brown was on it (I know realllyyy gross). Is there a better way to fix this?