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They almost look like some sort of slug (no shell like a snail) the do move and when I blow off the rocks they come off easily. They are the little brown things in the pic below, help please? Ate they good or bad?
I know people have had luck with Flatworm Exit by Salifert. Luckily, I haven't had an infestation yet (knock on wood). If you have any acros in there, get them out and into a QT until the issue is resolved. These things lay eggs like crazy. Good luck.