I just used black pond foam and stuck in the rocks when it was still wet. I sprinkled aragonite on that also while still wet. Worked great! Then I glugged out a big pile of silicone and stuck it to the tank back wall on the top only.
Nice I'm glad it inspired you to give it a shot.This looks amazing. I've been DIY dry rock, and it's very difficult. It looks like I stumbled across the wrong DIY! ... Looks like I'm gonna look into this now