so ihabs high ammonia 2pp and all others read 0 ??? I have a 24 nano 2 fish clown and chromis and a fire shrimp. I tried my hand at a cleaner to no avail and he died and I left him in there for lunch. Could he be causing my ammonia spike? Yesterday I did a 25% water change and tested a few hours later and it was good. Now I test today and its 2pp I did a 2 gallon water change now what????????