All water parameters have been stable (in safe zones) since I got them, I do 50% water changes about every 3 days with bottled spring water, because we have well water that even I can't drink sometimes. I think it has too many minerals. If I let a glass of it sit for about 30 minutes, I can see what looks like little bits of rust, (iron) in it. I use 1/2 tsp aquarium salt per gal, as I've read that it helps with gill function and is generally healthy. The tank is 80-82 degrees.