If i were you i would start feeding them once a day. Keep feeding the tank until everyone gets their fill. Even if that means the ray eats 30 pellets. I feed my tank a good 40-60 massivore pellets easily each feeding. And then i feed a filet of tilapia. then I feed super worms to my leichardti. You gotta take the time to make sure they all get food 
I feed in steps
1- A big handful of massivore pellets...followed by a second handfull. But only half the second handful goes in at this time.
2-I go into the kitchen and cut the fish filet into chunks...small to medium sized pieces. Throw em into a cup and then i stuff them w/ a massivore pellet. Not all the pieces tho....gotta trick em sometimes. My azuls are picky
3-I feed the superworms. Mainly for my leichardti. He will eat 10-15 each feeding. But i give a few to my black and silver aro as well. My bichirs eat em if they hit the bottom
Feeding my tank usually takes a good 10min or so. But thats okay. I enjoy getting splashed by my cichla
I feed in steps
1- A big handful of massivore pellets...followed by a second handfull. But only half the second handful goes in at this time.
2-I go into the kitchen and cut the fish filet into chunks...small to medium sized pieces. Throw em into a cup and then i stuff them w/ a massivore pellet. Not all the pieces tho....gotta trick em sometimes. My azuls are picky
3-I feed the superworms. Mainly for my leichardti. He will eat 10-15 each feeding. But i give a few to my black and silver aro as well. My bichirs eat em if they hit the bottom
Feeding my tank usually takes a good 10min or so. But thats okay. I enjoy getting splashed by my cichla
