Bear with me as I am going to try to give all the information I can. The tank he was residing in is 180 gallons with 7.8ph, 0 amonia, 0 nitrates and maybe a trace of nitrite. Tank is filtered with 2 FX6's and I do a 50% water change each week. (Well water that is filtered through our treatment system.) Tank's been up for 6 months since I cycled it and he has 16 other tank mates (peacocks and haps) ranging in size from 4" to 7" and he is full grown at 4.5". I treated him with medicated food soaked in garlic guard, focus and metroplex because I noticed him gasping and hiding and his color looked off. (He was not being chased or anything.) I assumed he had gill flukes, so the entire tank was treated. He stopped gasping and his color returned, but then he refused to eat. He no longer hides and is very energetic, as before. When I feed the tank, he takes food in and spits it out and will catch it again. (As long as one of his tank mates does not grab it.) From what I can tell, he has not eaten in about 2 weeks now, but he is not acting sick. I have tried soaking his food in water and also garlic guard and he takes it in, but does not hold onto it. I moved him to a quarantine tank yesterday and left him alone to acclimate. When I tried to feed him today, he took the food in his mouth, then spit it out. (He even picked it up a time or two, but never ate it.) I took the soaked (garlic guard) pellets out, thawed out some blood worms, tossed them in and he would not eat those either. I don't think he has ever seen them as I typically do not feed them to my fish. Sorry about the long and probably disjointed post everyone. (I am wrapping up here at work.) I am worried he might die, but I do not know anything else to do other than start trying to feed him various types of food till he eats one. Aside from this thought, I am out of ideas....HELP!