I have a trio of laticeps rays. My female stopped eating for like 2 weeks. Im a wc nazi so I wasnt worried about water quality issues too much. She became so thin that her skin was wrinkiling in some places. She showed no signs of parasites at all. Her two tankmates were also eating less but eating a lil. I thought she was going to die for sure, all day at work i tried to figure out ways to save her. I tried some tablets called parasite guard. bought them at petsmart. treated the tank. When i went to feed them that night , to my surprise she ate. and she continued to eat as much as she could. Now shes a big ol fatty! just my experience, im not sure if it was the meds that worked or coincidence.