I think it’s stringy poo. My fish get that when they don’t get fed for a couple daysLooks like a female. Looks very bloated. What is that string hanging out of the anus? Does it look like a worm or stringy poo?
You could try it, Is she pine coning at all? Kinda looks like dropsy to me also.She doesn’t look to have a gravid spot/pregnancy, no stringy poo from her. I’ve been doing epsom salt baths once or twice a day, I have freeze dried daphnia, should I try that?