Rayman, more like 20 bucks a week on one ray ( and that price is wholesale). Blackworms are starter foods. Once they you see a hump on the ray and no pelvic bones sticking out, its time to switch it to earthworms and shrimps.
Rays will resist shrimps for a while ( Though ive had rays eating off shrimp since day 1 ). Starvethem a bit.. with enough luck and patience, they will soon eat shrimps like
theres no tommorow.