help help help stingray

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i have a motoro ray and about 3 weeks ago he burnt himself on the heater and now he hasn't ate in about 2 weeks give or take, i tried earth worms, live blood worms, shrimp, he turns it all down and his ribs are showing, i have tried water changes styff with aloe vera, and hes not active will move around, even cought him swimming up the walls of the tanks a few times, how long can they go without eating? oh and he has fin curling