Are the fish bloated? Bloat can have the same symptoms also. Same syptoms, white feces... Any of this sypmtoms?
The first symptom is usually a loss of appetite. Other characteristics follow if treatment if not begun at this point. These secondary characteristics include abnormal swelling of the abdomen (hence the name-bloat), an increased respiratory rate, reclusiveness, white streaky feces, and sitting on the bottom of the tank or lingering at the surface. Red marks around your fish's anus or skin ulcerations might also be apparent (as shown in the picture below). Symptoms only appear in the latter stages of the disease; therefore, it is important to begin treatment as soon as symptoms are noticed, otherwise you will most likely lose your fish