I had to take down my 125g to put in new floors. I put my 3 fish in a 25g tub with lr,dt water, heater and powerhead. They were in there 4 days. yesterday I set my main back up with 50g of new saltwater. I took the powrhead out of the tub to help circulate water in the main. This morning my tang was sick. I freaked out and put all 3 fish back in the main ( I didn't acclimate like I usually do I freaked ) I think maybe I had an ammonia spike or the lack of circulation after I removed the powerhead stressed the tang out. When I put them in the main the tang was laying on his side breathing heavy but after about 30min he got up and started swimming. Is there anything I can do to help him with the stress.