hi guys i got a well established 125 gallon planted tank. Im having trouble feeding my new rectic sting ray hes eating and doing good, but he is only eating black worms. Im trying to wean him on to earth worms but its gonna take a while. also my discus and rainbows are eating all his food before it hits the bottom so i bough a tube that i put in during feeding to let the worms sink so the food can get to him. but my other fish just wont give up and keep harassing him while he is eating. so to the question if i bury live black worms in my sand bed will they live, reproduce and maintain a stable population for my stingray to dig up and snack on? thanks.