I have an old piece of driftwood. The main piece is nicely attached to a piece of slate. The rest of the pieces are broken off. I was storing it in the top of a box and hubby used it for a dumping ground. Anyway I'm going to use some invisible nylon thread to tie it back together, but the pieces are really fragile and hot glue would really help stabilize it. Is it a bad idea to put hot glue in my tank - isn't it just basically melted plastic? I have to do something, the base is not useable the way it is now.