I've recently become concerned about one of my neons, whose stomach has swollen to extremely large proportions. I'm not sure if it's carrying eggs, constipated, or bloated. Any advice at all is helpful.
That doesn't look good . Im afraid I don't know much about this sort of thing. Other members will have a much better idea than me. In the meantime, I would do a WC just in case it's linked to parameters.
Perhaps really over ate, I've seen small lumps form when they over eat, but never one as abrupt and exaggerated as that one hopefully, this is the case and you just got an odd guy.