Use some scissor and cut off a bit of the propeller to make it more round. This will lower the flow and won't be hard on the pump, and you won't have to shut it down on interval.
I did this with mine as it was too strong for my nano. Those impeller cost around 7$ to replace so no big deal, but do it gradually and do a test each time you trim a little bit because if you over do it, the flow will be too weak.
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More fish die from human stupidity than any other disease...
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