I have daisy polyps, gsp and a frogspawn affixed to the back of my Solana, its not glass, its plastic, but same principle. I have found that the GSP took right off and were colonizing the back wall in about a month, the daisies took about 8 months to get a good number of them onton the back wall. The Frogspawn is attached to the mag right now, I don't expext it to grow up the back wall, it just looks good back there.
Pics are on my build thread