I own a 10-gallon tank, fully cycled with a handful of zebra danios and neon tetras. one of the smaller tetras is showing a curious cloudy patch on his sides. As I look at it now this patch is not raised, "furry" or spreading to anyone else. could anyone give me a hand on a diagnosis?
Another question comes to mind, in an event he is sick, does he need to be quarantined or is that doing more harm than good to a schooling fish?
Thank you in advance.
Freshwater 10 gallon. 3 Zebra Danios, 2 Neon Tetras.