I run two MP60s. I have lots of small fish. I have never had this problem.
I know that doesn't answer your question, but I don't think this is a common occurrence? it would seem that your fish are weak or stressed before getting sucked in. A healthy fish should be able to sense the increasing current and will stay away.
Maybe you have them in a bad position in the tank? Can you reposition them?
How big is your tank? Are they oversized?
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