I posted this also in the nano reef forum. I have a 29 bio cube. Recently I had a hermit crab pull down one of my frags. The frag kept ending up in the sand each moring. I thought the snails were knocking it over. A few days ago one of teh frags completely disappeared. I couldn't find it anywhere. Yesterday I noticed a crab pull down my brown frag. I placed it in a different location. This morning I noticed a crab messing with it again. Has anyone experienced this?