feeding recently born teacup stingrays

[ped]

i have a breeding pair of teacup stingrays which have had 2 babies . i have been feeding them on whiteworm ,frozen bloodworm ,chopped earthworm.the pups are feeding very sparingly ,any food not eaten is removed and a small water change done .they are in the main stingray tank in a partitioned off section . the tank has a sand base and has masses of filtration and is well mature ,the ph is 6.7 .the pups are very active at night and are kept in subdued lighting in the day.i put some fresh food in at lights out as with all the activity at night they must come across the food and hopefully feed .again any uneaten food is removed .there is a small amount of light in the room at night .the babies look healthy but having read they are hard to get feeding i have been trying to find an established breeder for some advice.i separ