Alright, so I got a little goldfish, and kept him in a goldfish bowl for a month or so and he was fine, we fed him flakes but he didn't eat them and gave a betta fish pellet one day and he ate it so he was fed those... The other day I bought a "goldfish starter aquarium" and transferred him to that because the bowl broke (he wasn't in it at the time). He was fine the first day of so, and we started feeding him flakes again. Lately, he's had black smudged on hi head, and the tips of his fins but he acts like his normal, very active self.
Is it some disease, or the food/aquarium? I've read about ammonia/pH burns, could it be that?
Is it some disease, or the food/aquarium? I've read about ammonia/pH burns, could it be that?