hi, ive recently bought two regular goldfish about 2 weeks ago and i am keeping them in a starter tank which is fairly large but has no pump. I have noticed that they've both got a whitish bubble forming under their scales above their mouths. I thought it might have been something to do with the gravel but it came with the bowl so it should be suitable. Also one of the fish had a tiny black spot on its tail fin but now has a lot more black on it. Is this a normal colour change due to the stress of a new environment?
Thanks in advance
Tara
Thanks in advance
Tara