Anyone come up with a way to make a frag rock that you can stick to the wall with magnets? This one is nice but $80 seems steep. Seems like it could be easy to make.
https://www.bulkreefsupply.com/magnetic-coral-frag-rock-long-tunze.html
https://www.bulkreefsupply.com/magnetic-coral-frag-rock-long-tunze.html