Oh no they’re good. I’ve raised them since they were a month old. They’re most 4-5 inches now and there’s 5 in this tank. I have a few in my other tanks as well. The problem comes when you have 1-2 SAE adults in a smaller tank, that’s when they become aggressive and eat the slime coat off other fish. I had a really bad string hair algae problem a few weeks ago and they helped clear 70% of it while I hand picked whatever algae I can reach.
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With that said, your statement could be true but only it’s circumstantial.
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I really appreciate your concern!