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Hang on back filter water flow


subramn
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The flow rate should be fine for guppies and tetras. I have mollies and tetras with running an Aquaclear 70 on a 38gal bow front. I have the flow turned down but still flows pretty fast. I have thought about putting a piece of sponge on the outflow lip to deflect the water a little but have not done it. 

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If your filter doesn’t already have a sponge or other very fine blocker on the intake I would invest in one of those for raising guppy fry. Otherwise the little guys can go for a crazy ride. 
 

Guppies seem to like to have a flow to play in from my experience. Usually your tank has more peaceful water away from the filter when they want it. 

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