IDK about the green one...I don't think they EAT it...My little yellow clown goby would sit on the branch, and somehow that killed it......I really do not know how...I lost a purple plasma staghorn in one day....and it recently started to sit in my birdsnest and some of the branches have white on it...I would not put another one of these fish in my tank that has SPS....
This is my opinion based on what has recently happened