P/u a motoro ray from a friend, that does not want it. It was in a 55 gal. now in a 300 gal how can you tell the sex of a motoro ray at 7 in diameter or so and can you just feed it raw shrimp or gold fish?
look for clasps at the base of the tail, if you find em, its a male. and yes raw shrimp and goldfish would work. but keep a varied diet..goldfish lack the nutrients rays need
Go on google images and look up claspers if the ray has those its a male. Try not feeding gold fish they arent very healthy and alot of times have diseases
forget black worms and goldfish... black worms are a waste of money on a 7" ray... night crawlers pellets shrimps etc... add silver sides smelts clams cockles squid and what ever else you wanna feed