I have had my tank going for about 8 months. I bought my first coral frag, gsp, yesterday. The frag was on a small plug, which I just stuck on the bottom in the sand temporarily. The gsp opened up and looked good, but possibly had a little too much water flow where it was but I'm not sure. I woke up this morning and gsp is gone. The plug is still sitting there in the sand with no frag on it, and there is not part of it left. Is it possible it detached from the frag? Maybe something ate it? I tried to look around the tank to see if the frag was somewhere else but I didn't see it anywhere. I have a firefish, a small clownfish, 2 peppermint shrimp, 1 cleaner shrimp, and various snails. I have live rock so possibly have hitch hikers but have never seen any crabs. Any thoughts?