ok this is to have a link to refer people to for this topic.
1 ghost shrimp eats the equivalent of:
1 shrimp pellet every 2 days
1/4 hikari algae waifer every 2 days
1 flake food equal to what betta is supposed to eat ie the size of betta eye.
1 pea from a can or equivalant size of veggie.
all the poop your fish can make.
that is it.
if you feed your betta flake food your shrimp is getting enough.
if you feed your betta pellets just drop an extra one where the shrimp can get it
if you feed your betta live or frozen food your shrimp is getting enough.
hope it helps.