It's impossible to say at this point.
You may be overfeeding them, so I would fast them for a couple of days, and add epsom salt to the tank at 1 cup per 100G - it serves as a laxative and may solve your problem.
This is going to remain a high stress tank with all those zebra variants, they are all going to see each other as competition, and it's not that large of a tank. You may have continued health problems because of the stress!
Kim
You may be overfeeding them, so I would fast them for a couple of days, and add epsom salt to the tank at 1 cup per 100G - it serves as a laxative and may solve your problem.
This is going to remain a high stress tank with all those zebra variants, they are all going to see each other as competition, and it's not that large of a tank. You may have continued health problems because of the stress!
Kim