[Myka]

I've seen this happen with different Basslets and Dottybacks. It's a swim bladder issue. They come from deeper waters, and some have difficulties adjusting to shallow water. They need to go through a decompression when being collected, and sometimes this is too hurried. Their swim bladders are used to the pressure of the deep water, and in the shallow waters of our aquariums sometimes their swim bladders become bloated from lack of pressure. Apparently you can try to treat them by using a pin to pop them...but I wouldn't try it.