I think u had a fish that just wasnt perfectly healthy, and what I mean is that just like humans and dogs , etc. Some of us or them die as babies for no great reason. Just one day, we or its dead. It could be an internal issue or a genetic issue. He could have had a health issue that wasnt apparent until u found it deceased. Its unfortunate but it can happen. Ive seen fish perfectly healthy one day and the next be dead. It SUX alot but thats life I guess. A way of population control. U say it didn't have any visual health issues or damage from any tankmates so there's no real answer. Like others said, ur temp is a little high and if u dont have a good amount of O2 in the water, the total O2 saturation would be low and rays love high oxygen levels so that could be an issue as well. Also they have a very big appetite so if u dont feed them quite a bit, they will suffer and die from slow starvation so it could have been one of a few reasons. Im sorry for ur loss, been there too. Good luck in the future bud,
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Thanks so much, he always acted strange compared to other stingrays, he never buried himself but was active and was very social. I fed him black worms every day and kept him nice and plump, I don't think it was the temperature since his behavior didn't change when the temperature was raised a week ago. A birth defect was one of my suspicions, maybe he had a weaker immune system? And for oxygen I have a powerful double header airpump that pumps ALOT of air. I'm starting to believe maybe he was born early since rays are known to give early birth when in stress... Is there anything you think I should do if I ever plan on getting another ray? I did a water change again today and added some more aquarium salt to kill any diseases or parasites he might have left behind. Basically Is there anything I should know to avoid this in the future? Thanks again for yours and everyone's input!!