i had high levels at first to waiting for my tank to cycle properly, i took advice from here @ AA and it worked everything is great, i did a partial water change daily adding stress coat and zyme according to instructions on labels, and all is fine and no fish loss. oh and welcome to AA
55 gallon cichlid planted tank
20 gallon freshwater tank ( undecided )
5 gallon betta planted tank.
3 months into fish... and not doing to bad