most rainbows are just RBTA's IMO, there are some that are rainbows like Cherry Corals Colorado Sunburst and the Lemon lime. A true Rose Bubble tip anemone has red tenticales with a greenish base, at least thats what I've been told and have experienced. Rainbow in coral means at least 3 colors so I like to think the same for nems. Here is a pic of my RBTA