My female onyx clown has stopped eating and is just hanging out in her nem. The male is fine and is still eating aggressively. I have had the female for 2 plus years. She does have some stringy feces. Internal parasite? I have made a few changes in the last few weeks. Changed out some live rock and changed from a large nem to a small one. I purchased the nem from Optimum and there was no clown hosting it. There have been no new additions in terms of fish, and all other inhabitants are active and eating. What should I do? I'd be really bummed if I lost this fish...