Can’t glue corals to the back of my RSR

[A Young Reefer]

So I really want to create a GSP back wall , but only issue that it just won’t stick to the back of my Red Sea reefer I tried changing the glue no success .any tips ?

 

[Utubereefer]

Single frag mounts. I got mine on ebay

 

[Lyss]

Or some of those magnetic frag plugs

 

[A Young Reefer]

Sounds good .