They aren't called ghost shrimp for nothin - they can hide really well. Yes they could have been eaten, in which case you would see a big fat belly on your fish. They also could have died and either gotten wedged somewhere or sucked up by the filter. Or eaten.
125 - BGK, chanchito cichlid, pictus cats, silver dollars, palmas bichir
125 - cichlids (severums, bolivian rams, chocolate), rainbows ( turquoise, red), loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, tiretrack eel, pearl gouramis, betta
90 - Congo tetras, african knife, upside down cats, spotted ctenopoma, kribensis, delhezzi bichir
2.5 - betta