if your housing a harlequin and that is still on your glass, it's either lazy or full. lol Leave them be, if the harlequin doesn't get them, they will be fine.
I probably have 1000 of them in my tank. I bought a harlequin to get them under control. But I believe he became an expensive snack for my Melanurus Wrasse. They kind of drive me nuts, but are a fan favorite of any visitors.
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