well, im not an expert on african cichlids...but here are some info about your fish. Pseudotropheus Crabro (maylandia/metriaclima crabro). grows to about 4.5 to 5 inches. this fish is an omnivore... meaning they will eat a wide range of food, dried ,frozen etc etc. gammarus are okay i guess...if your fish likes it...so continue with it....no harm done. dont u think your fish is a bit lonely all by itself.. get more crabro ..hahaha
