In all my years of keeping fish, I have never seen anything like this. I have a school of seven threadfin rainbowfish in a 29 gallon tank. I left last night and came back tonight to find one of my females in bad shape.
It's rather had to describe but it seems as though her intestines are coming out of her anus. There is a large pink lump coming out of her that looks like her own tissue. Has anyone had anything like this happen before?
I'm attaching a photo to help with identification. The white specks are just air bubbles. For now, I have moved her to a ten gallon quarantine tank, but I don't know where to go from here. Can someone please help me ID this!?

It's rather had to describe but it seems as though her intestines are coming out of her anus. There is a large pink lump coming out of her that looks like her own tissue. Has anyone had anything like this happen before?
I'm attaching a photo to help with identification. The white specks are just air bubbles. For now, I have moved her to a ten gallon quarantine tank, but I don't know where to go from here. Can someone please help me ID this!?
