The Green Spotted Mandarinfish, Psychedelic Mandarinfish. This challenging fish to feed is a great choice for a reef aquarium, but should not be added until the aquarium has matured for at least one year. Due to the size of their mouths and the fact that they are bottom dwellers, competition for prepared food is challanging. They must have access to live prey food, cocopods and amphipods, wich live in the live rock and sand. The Mandarinfish and the Six Line Wrasse both prey on the problematic red planaria flatworms that can be introduced with corals.