New to reefing in general...I just got my first zoas from a local coral and fish shop. What are these things I find that are messing with them? Are they harming the Pandora's or just annoying it? Lastly, should I try and eradicate them? If so, with what? 55gl with bta, 2 clownfish, cleaner shrimp, sand sifting star and some cuc... Links to YouTube where I uploaded videos