i currently have a 4ft 170l aquarium ,its a community tank with tank mates such as angelfish,kribs zebra dainos and platys and mollys,1 of my m8s says he has breed some rainbow cichlids and says i could have a few off him as they are still young.he says theyl be fine in my tank as they are none aggressive,but i know with cichlids you have to be careful about what u introduce to your community set up,would these fish be okay or not?.