You guys are lucky - neither of my hystrix would touch any pellets massivore included. They literally run when I put the pellets in.
Shrimp
krill
canadian nighcrawlers
squid
clams
black worms
Super red worms (I have a worm farm)
blood worms
Quick question... Have you found any packages larger than 2.2 lb (1kg) for mass or gold? Or larger than 4.4 for sturgeon????
I was just thinking about the 10mm NLS pellets, anyone feed those? Seems like a good size also, I got some 2mm pellets a while ago for different fish I have and was very disapointed when they showed up, those things are so small only good for fish under 4inches and I dont have too many of those. Do you find the carnivore pellets too small and the massivore better size pellets? 
Just over $100 per month for T1... Not too bad considering his stock and high quality food.
How do your rays like the superworms?? Mine swim to the top to get hand fed. They can't get enough! And, I gotta imagine that superworms are hugely beneficial to our rays, nutritionally.