Hi yall, I just got this fancy goldfish and introduced them to a new 20 gal tank. At the store I bought them from they looked fine, but after a day in my tank, they've developed this white film on them. In the tank next to the one I got my fish from, there were a lot of Popeye goldfish covered in white, what I think what could be ich, and dying. I think what my fish has is some bacterial or fungal infection, but I'm not sure exactly what. I cycled my tank for a few days with Prime and Stability, and parameters look good. 0 ppm ammonia, 0 ppm nitrite and no more than 20 ppm nitrate, 150 ppm hardness (I live in an area where the water is very hard), 0 ppm chlorine, 40 ppm akalinity and 6.8 to 7.0 ph, and temperature of 70. The fish was swimming around day 1, but today has been sitting at the bottom of the tank in the corner.
Any help, input or advice is greatly appreciated!