I have a motoro ray and I was wondering how many earthworms should they get a day? My main problem is that there is also a silver aro and a parron in the tank and the all like the worms too. They get a mixture of aquadine pellets in the morning and right now I have been choping up about 5 earth worms a day which usually makes about 15 bite size pices. They also get ghost shrimp and black worms once a week sometimes more. They just always act like they are starving. Do they need more? Thanks 