Ok guys here is one for yous. My nitrite is high in my tank so im doing alot more water changes until i get it back down i i have 2 rtc in my tank. My friend has been keeping fish for years and he has catfish in his 6ft x2ft tank. He has never lost a fish yet. Hes never used any safe water or any type of stress coat when he does a water change. Now what i want to know is do you use anything when you do a water change or not. Let me know.