My sixline wrasse is breathing really fast and hard, and I think he's going to die. On Monday morning he was lying where he sleeps, and breathing really fast, later that night he swam a bit and was knocking into the glass and couldn't swim properly. I put him into a bucket with new water that had the same parameters as the tank's. This afternoon he is looking really bad, I did a freshwater dip and nothing came out, and I put him back into the tank. He doesn't have white spots on his body, but his nose does have a tiny bit. The only think that I can think of is potentially my nitrates being a bit higher, however all my other animals seem to be fine. I have dinoflagellates too if that's something. He was completely ok before that morning. Pls help me thank you.