well all 4 of my festae ,my 4" cuban,my 4 " jag,and my 2 texas cichlids all have the white poop.. i will treat with what i bought for the time they recommend,and if it don't work looks like i will just start over with new fish. i am not going to go broke over a handful for 3-7 dollar fish. sucks but thats the way it goes .. i never had a single issue with my piranhas ever .