i have some freshwater rays that when i first got them is all they would eat was blood worms i tryed to throw just earth worms in for them to eat but they dident want nothing to do with it so i started to throw the earth worms in with the blood worms and the started to eat now they will eat anny thing and every thing lol so my point is that i would try and mix the food that they eat now with the food you want them to eat