There is a question coming at you
I have a Aqua Rocks scape in my tank ,, you can do a quick search to see what that is

Its a very open scape ,, at least mine is ,, I was going to ,, after I got zoas mounted everywhere on the scape that I wanted them ,, I was going mount more zoas to my back glass panel ,, because of that open scape ,, light does hit that back panel ,, as SPS corals grow & get larger ,, the areas where light hits that back panel will become smaller ,, but because of the way this scape is ,, there will be places where light will always hit that panel ..
Then I saw your post on this vertical mounted chalice

why mess around mounting zoas to that back panel ,, glue a chalice frag to the glass ,, there is no reason for it not to grow there ,, if it can grow vertically on your rock ,, it can grow vertically on a glass panel ,, So, my question ,, I have seen chalices grow on the glass in bare bottom tanks ,, WWC for example ,, I have know idea if they are stuck to the glass or not ,, If I glue a mounted chalice frag to the back panel ,, as it grows off the plug ,, will it stick to the glass ,, or ,, will it not stick to the glass ,, and over time the weight of the chalice will pull the original frag plug off the glass and fall to the bottom of the tank?
I am starting a ,, mostly Chalice only tank ,, tank has been ordered from Mircales Aquariums 48x24x15 ,, it will have some cherry picked acans in the tank though ,, Chalices from my display tank will be moved over to this new tank ,, but I can and will mount some chalice frags to that back panel ,, depending the answer to this question