Don't let all this talk of breaking and gluing get you down, corals are way tougher than we sometimes give them credit for. Since this is your first piece, keeping it semi mobile would probably be a good idea. Frogspawn can send out some pretty long sweeper tentacles and as you add more corals, you will want to keep them out of reach of froggy. It looks like you've got the plug wedged in pretty good there so I think you're off to a good start. Pretty soon you won't even be able to see the base anyway, they grow like crazy, even under pc lighting. I have to frag my frogspawn all the time. Oh yeah, it won't encrust, it grows like a tree, and it likes plenty of calcium to build a nice strong skeleton.