just a basic question about feeding small rays,,, roughly 5-6 inch disk,, right now i am feeding frozen blood worms and live black worms,, when should i try some red wrigglers/earth worms? should i start by chopping them up or feeding whole? then when to move onto some talapia ect. i know i could probably do all of the above now if i cut the pieces up small enough but should i wait until they are bigger for any specific food?