get the rays to eat first than medicate.give those rays some earthworms/nightcrawlers for a week 3-4 times a day you can easily target feed them with big worms.worms will make them pack on weight.you can probably go to walmart or bass pro and buy some bait from the fishing section.blackworms are a waste if the rays are small chop the earth worms in half
....she wants me to have my fish bussness, but doesn't want me to buy fish...just sell what i have now