hey, so i brought a group of datnoids (8)a week ago. ranging from 3-5inches, atm only the biggest one and smallest one eats dry krill but not crazy. eatting only one at a time, so im worry about the others, i try MP but only the smallest one ate, others seem to looking. at it and leave, should. i feed them feeder first until they feel more confortable? what should i do. ty