Moonlight's can get to around 15cm, but are one of the more peaceful Gourami's and I have seen them in aquariums with small Tetra's without problems.
Their silver body looks stunning under the right lights.
Males can be aggressive towards other Males during breeding.
They should be housed in an aquarium that is planted.
pH - 7.0
GH - 100 - 150ppm
Temp - 24 - 28c