I have a large red velvet fairy wrasse who has been healthy and established in my 90g tank for a year. He is the dominant wrasse in the tank and no other fish both him. A week ago he started acting differently - less social, not flashing, not eating as well, hiding more, and not swimming as well. Over the course of the week he's gone downhill and is now mostly upside down but still breathing. He hasn't eaten anything in about 4 days now, and I don't think he will make it much longer. I was finally able to catch him from the rocks today and have placed him in a breeder cage with holes and pvc to hide in in the tank while I figure out what to do. He has no signs of ich or flukes or injury. He has been fed a steady diet of frozen mysis, marine cuisine, and often voraciously eats the nori sheets that I hang for my tang. My gut tells me this is swim bladder from constipation (though diet-wise he shouldn't be constipated). I have no other ideas what it could be. He isn't eating so feeding peas are out of the question right now. Is there anything I can do manually to help with swim bladder issues? Does anyone have any other ideas as to what I can do to help him? I have both furan-2 and maracyn II on hand, as well as prazipro - but I don't see anything that would lead me to know whether it makes sense to use any of these or not. Any advice or help anyone can provide would be very much appreciated. Thank you!!
EDIT: A few other pieces of info - salinity is 1.026, temp 79.0, trace nitrates, no ammonia/nitrites/etc., pH 8.2. When I was trying to catch him he tried to swim a few times and just went in upside down circles until he'd land somewhere. He's really weak and not well at all. I started seeing clamped fins on him last week and he seemed very unsteady on this feet before he started really going downhill. Now his fins are very widely splayed and he's pretty stiff, but still alive and looking around.
EDIT: A few other pieces of info - salinity is 1.026, temp 79.0, trace nitrates, no ammonia/nitrites/etc., pH 8.2. When I was trying to catch him he tried to swim a few times and just went in upside down circles until he'd land somewhere. He's really weak and not well at all. I started seeing clamped fins on him last week and he seemed very unsteady on this feet before he started really going downhill. Now his fins are very widely splayed and he's pretty stiff, but still alive and looking around.
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