I took 2 rays in for necropsy at our state university. Cost me $200+ and found out little. I did, however, find out that there was no bacterial infection... so that was a plus.
Sorry for your losses. Most of us here know exactly what you are going though
Really sorry for your loss. I had that happen last summer to one of my 3 year old BD females - eating well - came home to find her dead in the tank. Other 3 rays were fine. Couldn't pinpoint the cause.
Thank you everyone for your posts. Just cleaned out tank and sump. Gonna let sand sit for a week then time to get going again. I'm thinking earthworms because after cleaning out tank and sump was clean of all debris and water parameters still good. Gonna send rays out to see what really happened. Really looks like a bacterial infection after looking at my departed rays but i will find out. Going to get tank cleaned and cycled then stocking with rays and maybe peacock bass also. Hit me up if you have pups or bass you are willing to part with. Thanks