I got my hybrids eating this stuff... 
http://www.hikari.info/tropical/t_10.html
It has pretty much all of the same ingredients as Massivore Pellets, with the except that it has CLAM extract as an appetite stimulator
It also has just slightly less added Vitamins in each category...
Oh yeah and it's a little smaller size than the Hikari Carnivore pellets so they swallow them up really easy.. they just lil rays....
Now they eat both massivore and marine-A but they don't touch krill or mysis shrimp
http://www.hikari.info/tropical/t_10.html
It has pretty much all of the same ingredients as Massivore Pellets, with the except that it has CLAM extract as an appetite stimulator
Oh yeah and it's a little smaller size than the Hikari Carnivore pellets so they swallow them up really easy.. they just lil rays....
Now they eat both massivore and marine-A but they don't touch krill or mysis shrimp