Hey guys, need a little help. Water is good, no ammonia, no nitrites, nitrates as close to 0 as they have ever been and my tang is being a lump. He sits behind a rock close the the back of the tank and leans on the rock. No labored breathing, no discoloration... nothing that would indicate being sick.. maybe just stress? I did do a water change yeseterday... he has been in there only 4-5 days... he has been eating seaweed that i put in there, nothing else really. When he is swimming (Which actually was quite a bit before) he swims up and down the back of the tank from one end all the way to the other with his nose up against the glass.. weird for tangs or not really? Any help would be much appreciated.