Ok, i got a new water changer today. And i just did a water change. I normally do a 10-20 gallon change, but i did a 50 and now there all hanging on at the top gasping for air. And one of my tropheus is laying on teh bottom. Im worried! I dosed aquasafe before the new water entered the tank and added their salt and ph buffer during. Everything is in check. Do u think they will pull threw?