I had a royal gramma for about a month. The first few weeks she seemed fine except She hid alot and I noticed white spot at base of tail fin that was only there for a day or two. I thought maybe from hiding in the rock. Then the tail fin became ragged and quickly was gone and she became lethargic and died. I have 2 clowns that were in there first and have been great. Here are some pics. They aren't very good. In the last one her tail was getting ragged. Any thoughts on what this is?