Need advice about my rec

Very difficult almost impossible to see him in the pic. Assuming he has good weight on him i would continue. Make sure the worms are cut up so the shrimp can take on the juices of the worm. Give him both the shrimp and worm mixture. Then start to try him on just the shrimp after a few days of giving him the mixture of both.

its not a good pic but the edge of the disc looks frayed. try get a better pic with white light to make sure hes ok before trying new foods.

i replied to another thread a few days ago about getting rays onto new foods using the "worm juice" method that might be of use but you need to make sure everything else is ok first

If he still looks healthy enough to stare more keep going. When he does look skinny to the point that he needs to eat just feed him well one time and one time only his food he usually eats and then go back to the other for a few days till he looks hungry and keep repeating. Eventually he will switch over and eat the new food but don't feed him multiple days of the old foods.

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Retics can take a long time to transfer foods. He looks to be in decent condition to me but id have to +1 Didysis.

keep in mind looking hungry and looking skinny are different things. i dont use the same method as didsys but everybody has their own methods i guess.
to me if you are trying to introduce a new food and keep going back to the old one the ray will hold out for what its used to and get skinny.

best thing i guess is to pick a method and stick to it untill the ray either looks skinny or is eating the new food.

looking at your new pics, your ray looks good. nice fat tail too

something i just noticed. ... your substrate looks quite deep. rays like to "dig" in the substrate and i would be concerned about dead zones and bad bacteria in such deep substrate. something to have a look into at least. i dont know if you have one but remember you need a heater guard.

good luck but im sure you wont need it