Like others said, they're harmless. However, I did read about a guy who had so many of them pile up in his ATO float switch it got stuck on .
If you really want to introduce some population control, wrasses will eat them. I'd say go for a sixline wrasse but with an 18 gallon I'm not sure I'd put one in there. They can also be a-holes and problem causers of their own
Hunter (evolved) would be the guy I'd ask about the sixline
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