how do you get one that sixe to eat!!!!!! My 4 inch Reticulated is showing just skin and bones and I haven't seen him eat in a while. He used to eat a lot.....but not lately
What are your water parameters (pH, ammonia, nitrates, nitrite, etc.). Retics tend to be very sensitive to water parameters so any change could cause them to go off-feed. Also, what else is in the tank? Any other fish stressing it out? Try giving it live blackworms. Hopefully it's not too late .
As Deathcurl said, water parameters are crucial with small rays. Live blackworms are generally the way to go to fatten these guys up. Rays can't say no to 'em.