Hello all! My yellow tang started acting very strangely a couple of days ago....and I think its getting worse! please help anyone- i love this fish! The tang is acting extremely stressed, he hasn't been swimming but only hiding in the rocks and is very touchy if any other fish comes by. He is also breathing very hard consistently. Yesterday he wasnt even interested in food! I am really worried I will lose him, can anyone help?! I tested the water today again and everything is great--all of the other fish (a damsel and a clown, along with 2 urchins, snails, and crabs) are doing just fine, too! Nitrate: 5mg/L Nitrite: 0.5mg/L Alkalinity: 250KH PH: 8.6 Ammonia: 0 mg/L Specific Gravity: 1.023 Thank you for your help!!!!!