i wouldnt expect the fish to swim in the current, thats not a good indicator of whether or not you have enough current... me personally, and i know i go overboard with current, i'd have the filter return, plus at least 1 powerhead at about 1000-1400 gph .... even better 2 for a total of 2000 in a 75 .... still, and quiet water can make them more "jumpy" whereas lots of action and noise in the water simulates a more river environment, and "dulls" external noise/vibrations, not to mention the slime coat and strength benefits of having strong current
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