I have a cleaner wrasse which has been in my display tank for 3 months. I recently added in two new hydor evos and changed up the circulation in the tank. He stopped eating around the time i put the pumps in, i don't remember if it was before or after. A day after i put the pumps in i noticed him eating bubbles off of a pump power cord which was odd, he was also gasping at the surface. I have see fish gasp before when oxygen content was low in fresh water tanks, but i have a big protein skimmer so oxygen content should be good. Plus my clown was not showing any signs of stress so i figured that wasn't it. I tested ph ammonia nitrate nitrite and alkalinity, all are normal. He went to bed 2 hours early last night (he sleeps in a little hole in one of my rocks) An then did not wake up this morning. Three hours after he normally wakes up i figure he is dead and go to pull him out, but after shaking the rock about and trying to suck/blow him out with a turkey baster he come swimming out. He swam about all day acting normally, but he hasn't eaten in 3 days, and still refuses even beef heart which is his favorite. If i can get him eating again i think he will be fine, what can cause fish to stop eating?