To many dried foods in there diet, which can cause constipation and swim bladder problems, need a varied diet of frozen bloodworms,brimestrimp, and daphnia, etc,veg in peas,broc,cumumba etc, and they like algae tablets too, try some shelled peas, boil for a few minutes, let cool down, pop out of shell squeeze between fingers till mushy then add to the tank, do this for a few days, then let us all no if the poo is still long white and stringy, the baby fry will need some baby brime strimp.