So after a few days of darkness to combat a bit of cyano in my frag tank I noticed a hermit on my beautiful rainbow monti frag, which looked like this with some weird little algae: Closer view: Magnified: So, I guess this is a monti eating nudibranch infestation! I totally had the wrong scale in mind and thought they were very, very tiny. Holy cow. After I calm down and eat dinner (and maybe have a drink), I will search for what to do. Fortunately this is not from a mature display tank featuring amazing montis. I have other tanks with no montis, so I guess I could try dipping affected frags in something, then putting into different tank and wait it out in both tanks. I have at least 3 nudis here at home with me now and possibly more at the school tomorrow, so if anyone has been wanting to try a little experiment to eradicate them, here is your opportunity. Post your idea and I can do it tomorrow. Hmm. I have never seen them before in my tanks (always looked for tiny specks!) and dipped monti frags after last swap. Source is a mystery, as is usual I guess.