DIY frag hold/ Liverock with magnets on back wall

[zgerike]

After making a diy refugium yesterday I was in the building mode so I took some magnets off of some powerheads I was not using and added them to liverock so I could put them on my back wall to grow coral off of. All I used was a little bit of hot glue to hold them together, just need to add some coral to them now. Was thinking some montipora caps would be cool growing out towards the front, any ideas for what coral would be cool to add to them?

 

[RobertP]

I have had issues with hot glue holding in the long run. Would seriously suck to have some nice frags on your rock get crushed if they fall...or worse scratch your glass. Have had great luck with epoxy.
It is really nice looking.