I have a 125 gallon tank that’s been running for about a month and a half. Ammonia, nitrite, and nitrate levels are all good. I have 2 black onyx clowns that were the first fish in the tank. I have 3 other fish now, but they never bother the clowns. The larger of the 2 stopped eating. I feed mysis shrimp, bug bites, pellets, and nori. He used to eat it all except the nori. I’ve dropped the food right over him while the other fish are eating at another part of the tank and he ignores it. The only fish that ever exhibited any aggression towards him is the smaller clown. The smaller one will occasionally swim at the larger one as if chasing him off, but other times they are together no problem. Since I’ve had them, they swim together sometimes and other times are doing their own thing. I don’t see any visible signs of stress or injuries, but he just started not eating and I want to get ahead of the issue before it’s too late. Thanks for any advice!