So I've had this fish for a year now, this guy must be at least 3.5" and he eats like a champ since I got him, he's a big aggressive fish maybe approaching 2cm thick, he eats several times a day but this past weekend he started acting weird, he started spending a lot of time inside the live rock and refused to eat, I didn't have time to do a water change so I waited until yesterday, surprisingly he ate before the wc, not with much enthusiasm but he did, did the water change and expected to find him today eating and acting normal but that didn't happen, this guy hasn't touched the food and is acting strange, he looks disoriented, he doesn't have any signs of Cryptocarion, velvet u another external disease, but he gasps and breathes faster than normal so there must be something internal, however I don't understand what could be happening to him, I have searched for information all afternoon so many experiences are based on the symptoms that I described in my fish and also a white fibrous poop which has not been presented yet, internal parasites are the most common here, something I also found information about was gill flukes and some type of blockage or stomach discomfort, can anyone here give any other opinion?? I feed my fish mysis, flakes and seafood porridge containing squid, peas, garlic, clams (I think) and I don't remember the other ingredients.