Our water here is pretty bad. It has about .25 ppm of ammonia in it. I've tried using extra prime to get rid of it, but it doesn't seem to work. Could something else in the water be giving me that reading? I've kept goldfish in it for years. I've had my betta for 1 1/2 weeks, and he's loosing scales! Should I switch to spring water, or is their something else I could try?