Thanks for sharing, do you have a photo?Someone else with a green striped infestation....I don't feel alone anymore.
My timeline for green and red discoma coverage like that was about 8 years, should have killed them off at the base of rock structures, now the little green ones shed and settle wherever they wish weekly.
I've been using Franks F-Aiptasia and started using vinegar, with the vinegar they seem to detach to be siphoned out, the franks pretty much kills them, but any bits of tissue left will regrow.