thank u, I don't know of anyone w established tanks. I did add the right amt of salt to the tank last wk b4 I treated and have been replacing as I change water. What kind of help for it could I get at lfs? I did buy this product when I bought patasite mef., but was afraid to use it, thought it might make my nitrite higher? says for reactivating filters damaged by meds, also says nitrifying bacteria so idk says ok for new tank