I've always read to simply continue to check and clean them off at night for a couple weeks and then periodically check after... You could also maybe get a six line wrasse or yellow coris wrasse. They will usually eat them (during the day) and should help in your battle but wont solve your problem completely. I personally prefer a yellow coris wrasse. I've only had one but it ate any small snails and flat worms like a champ. Plus they aren't as territorial as a six line.
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