He has since attached himself to a rock, however, it's inside of my cave, not a big enclosed cave but in the shade for the most part. He was doing fine yesterday and I target fed him some brine shrimp, however, today, he seems to have an issue, he's mostly closed up and I noticed some brown stuff (goo,slime look) just floating off of him, haven't really found any answers to it so was wondering if anyone could clue me in a bit, is he dying or sick or is that normal from time to time?