I have a Mandarin that is about 3/4" long. I think she may have gas bubble disease. She was in a 40 gallon tank with an oversized filter that waterfalled in and created lots of bubbles. She has been moved to a 1.5 gallon aquarium with a small filter. She has been in there for 3 days and the skin bubbles appear the same size.. Any advice is appreciated. She is eating fine.