Yep, you'll have to remove it. Easiest way is to find a place where the mat isn't really attached and slowly peel it back from there. You can use a razor blade to start it, and help it along.jemwhitman said:It sounds like it is necessary to remove the coral from it's current attachment and use the glue gel to attach it to the back of the tank. - I'm still a nubie so please bear with me. If this is the case, what is the best way to remove the coral from it's current attachement?