I have a yellow guppy that has dark orange growth spots near the back of him and slightly on his tail. It looks like the scales are inflamed or something. It used to be smaller, i thought the orange spots were just part of him, until about 2 weeks later i notice they're definitely big now and look painful. He is still acting healthy and eating with his two other male guppies, the only ones in the tank.
I suspect something happened when i transferred him to his new 5.5gal home two weeks ago. I used a product (by the recommendation of someone knowledgeable) that was supposed to cycle my tank in two weeks, but my readings at the end of the two week period were way off. no nitrates, and the ammonia was 0.5! I instantly did a good water change. The water itself looks crystal clear tho.
Heres pics, but theyre horrible and from my phone. atleast u can see where the growths are, though. Thanks.