That is curl setting in. They don't always die right away . That looks like stress curl rather than death curl.
I've had my rays curl up like yours for weeks before dying due to unknown stressors . I've also seen the death curl with in hours rays fine than curls and dies .
Your ray is very stressed I've never been able to save one once I seem this but I prolonged one for three months a few years ago . You can try increasing temp to 85-87 . Add a bit of Epsom salt and pure salt . About a cup per 100 gallons .
The salt will help with stress and heal any internal wounds , the epsoms may help clear the ray out but unlikely as the fish needs to ingest it to really work well. And increase oxygen as you increase the heat.
Hope it works. Put some sand in the tank and lots of live black worms. The ray will eat at night when it wants. Keep lights out for a long time .
Sent from my iPhone using MonsterAquariaNetwork app
I've had my rays curl up like yours for weeks before dying due to unknown stressors . I've also seen the death curl with in hours rays fine than curls and dies .
Your ray is very stressed I've never been able to save one once I seem this but I prolonged one for three months a few years ago . You can try increasing temp to 85-87 . Add a bit of Epsom salt and pure salt . About a cup per 100 gallons .
The salt will help with stress and heal any internal wounds , the epsoms may help clear the ray out but unlikely as the fish needs to ingest it to really work well. And increase oxygen as you increase the heat.
Hope it works. Put some sand in the tank and lots of live black worms. The ray will eat at night when it wants. Keep lights out for a long time .
Sent from my iPhone using MonsterAquariaNetwork app