I haven't checked the parameters lately but it's a 37 gallon tank with 1 angel fish, two clown loaches, 3 cories, 6 rummynose, a clown pleco, 2 cardinals and 3 black skirt tetras. She hasn't been injured but she had ick about a year ago and almost died. then this thing started growing on her lip. I don't know if it's related. It's not a bubble. NOw it's round and about the size of a pea, a little bigger actually. It's very scaley. this tank has been up and running for about 9 years. It's planted and has co2 injected into it.