For a little over a week now, a honey gourami that has been thriving in my 10 gallon for about 8 months has begun to waste away! I noticed a few weeks ago that his fins were looking a little ragged so I began adding some stresscoat to help him heal. At that time, I also noticed that his color was faded and his gills were looking a little red. He appeared to be stressed in general and I figured I would move the plants around my tank to give him some new hiding places to help him recover. The water parameters at the time had ammonia and nitrite at 0, and nitrate at 20 - little higher than I would prefer. I did a water change afterwards to bring the nitrate down. Anyway, his behaviors during this time remained the same, still eating like a pig and chasing around everyone else in the tank, but the fins and gills and color did not improve. Then, about a week ago I noticed that he was becoming very thin and hanging around the bottom of the tank. I've been feeding brine shrimp in hope of plumping the honey gourami up, but he seems disinterested in food and does not eat. He will eat a little bit of flakes, but no brine shrimp. I've been throwing in bottom feeder tablets as a last resort to ensure that he has an opportunity to eat at least something when he's ready to. Strangely, he does seem to enjoy the tablet quite a bit and spends quite a while picking at it (much to my panda cat's disliking I think..) The other thing that has me concerned is that his swimming seems to be slightly labored and he spends a lot of his time sitting around the bottom of the tank. This might sound strange, but it almost seems like he is tired.. Every time I come to the tank to watch, he is happy to see me and comes out right away to greet me. (Honey gouramis are the friendliest fish I have ever seen!) Only now, after a minute or so he makes his way to the bottom to "sit" down for a while again (upright like he is sleeping, not on his side). I've also noticed that he kind of wiggles while he swims, like he is struggling a little bit. Something else that I find strange is the way he is now breathing at the top of the tank. The best way I can describe it is that he breaths aggressively.. He makes quick motions towards the air for few seconds at a time, instead of calmly poking his nose out of the water to breath. Otherwise there are no sores on him, no spots, no strings, no swelling, or any other signs of parasites. So far, the actions I have taken have been as follows - first, a large water change, followed by turning up the air stone to help him breath (I'm still unsure if that is something he is struggling with), changing his diet to mostly brine shrimp along with the bottom feeder tablets (so he doesnt have to compete for food and can eat when he is ready), and removing my carbon filter and adding 5ml of melafix daily. Since adding the melafix, he seems to have perked up a bit and his fins are improving, but he still sits at the bottom quite a bit and does not eat much. My other fish, a panda catfish, another honey gourami, and three rummynose tetras are all extremely healthy. My other gourami's colors are vibrant and my rummynoses are living up to their names.. (I should also note in case anyone is wondering about bullying, my sick gourami is king in this tank and is generally unbothered by my healthy one. Even while ill, he still chases my tetras and healthy gourami around as best he can!) Lastly, I checked the water a few days ago and the ammonia and nitrite are both at 0. I didn't check the nitrate because I had just done a 50% water change, which should have lowered it anyway. (I will be checking water parameters tomorrow, nitrate included this time) I am at a loss right now because I don't know if this is a parasite or what? I also have no idea how to get him to start eating properly again. I think if it weren't for him picking at those tablets who would have died by now .. Does anyone have any ideas on a type of medication I could try or any other remedies? This fish has been with me since I started this tank and I admit, I absolutely love him! He swims up to greet me the instant I walk up to the tank and he has definitely gotten me through some sad days (parents announced divorce a matter of days after I brought him home). I am willing to do anything to help this little guy out!