Meaty means frozen mysis shrimp,clams,silversides,krill,cyclop-eeze{ a type of daphnia},zooplankton,vitamin enriched brine shrimp.Do not use beef in your tank..ever seen a cow in the ocean?
I dunno if brine shrimp are the best sea horse food, but you can generally get the live from pet stores or you can grow your own from kits. Used to call 'em "sea monkeys" when I was a kid.