Thanks for the reply. My first attempt wasn't successful; the coral has not stuck and was up side down in the substrate!! Oh dear, yes indeed!! It seems that a simple task of sticking the coral and rock together with a small piece of epoxy resin is beyond me. What a plank!! I have wedged it in a crack which is working better for me, but now I have a great big blob of purple that sticks out like a soar thumb which has STUCK FIRMLY TO THE ROCK. oh the irony of the situation.