I have a six line wrasse that I found in a bubble. It looked like it had built the bubble around itself and it was lying still near the bottom of the tank. At first I thought he may be dead, but he was still flitting and breathing. I got closer to the tank and he shot right out of the bubble and starting swimming as normal. This was about a week ago and he is acting normal. This is the only time I have seen it do this and i have had it about a year...any ideas whats going on?