Hi everyone, I received a shipment of 1 male and 3 female guppies from a very reputable fish breeder last Thursday (July 6th). All seemed well with them and none really seemed worse for the wear. They were placed in a cycled tank with 4 corys that were also in quarantine. One female gave birth on Friday night (July 7th) to two fry. This was a bit surprising since I'd just received them but I went out and bought a breeder box and continued on with my fish keeping. Another female gave birth Monday (July 11th) to a considerable batch of fry (between 15-20). Today I found one of those females (not sure which since they both have the same coloration) dead at the bottom of the tank. She hasn't been acting weird and didn't seem sick or lethargic so the death seems strange unless it was stress that finally settled in. My tank is all within normal parameters. (Between 0-0.25 ammonia, 0 nitrite, about 20 nitrate). I took some photos of her before disposing of her and it seems like they may have been come abnormalities. I'll include those in my post. I've highlighted a few areas that I feel are concerning. Does anyone have any idea if this could've contributed to her death and does it look like a parasite/disease? I'm very nervous about my corys and remaining guppies now thinking that she may have had something spreadable. Any ideas? I've e-mailed the breeder but I thought having additional opinions may help immensely. I'm relatively new to the fish keeping hobby and all of this parasite and disease stuff is confusing!