I like them. I have rarely heard of any issues with them in a reef tank. They like to eat poop... which not many other things out there do.
Here's how I think of it: If its larger than a couple inches, if I can... I'll take it out. I keep the smaller ones around.
As for getting him out... a trap is easy. But the good old plastic tongs and a quick hand are the fastest and easiest way to get him.
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They call it addiction for a reason...
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