Like I've said, watch him and try to positively ID him before you give him the boot. If he's relatively harmless, keep him. Else, vote him off the reef. If it does feed on monti and acro and you don't mind letting them get nibbled on a little I'd leave him. Then again, you might want to keep the population under control so they don't get out of hand. It's all up to you. I like nudi's so I try to keep them if I can.
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