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Yes, I'm using the API master kit, and my nitrate levels for my tap water looks close to 0... that doesn't sound right though.

I have 5 black mollies with a gourami and 3 cory catfish in a 20 gallon tank. I noticed that one of my mollies was acting and looking strange so I looked up diseases that mollies get. The molly has a lot of white scales, and has been swimming very poorly. It was curling its tail to the side and...