so I picked up a rtc the other day got him in the tank all is well with him for a few days, and I did a water change today and he is under a powerhead just sitting there and I noticed on top of his head it looks like smile coming off his head and backside, I think maybe he got stressed out and such from the water change possibly..... so I turned up the temp to 84deg, should I add salt in the tank as well .... there are others in my tank here as well, what all is there that I can do to prevent anything from wiping him out and my entire tank ?