www.bulkreefsupply.com
I basically made something like the tunze for way less. I took a small shelf piece of Marco rock sanded down and drilled into and added ceramic magnets then sealed in aquarium silicon and attached magnets on the outside. It wasn't a cave, but I had red monti cap on it that grew super fast and now has a cave like structure in it that my Springeri Damsel sleeps in.Welcome to the reef!
If it was on the glass I have made a small cave with these rocks.
If not it may be something like this:Magnetic Coral Frag Rock Long
The Tunze Magnetic Coral Frag Rock is the best way to show off your frags in a display tank setting. Grow your coral frags, or to add to your aquascape anywhere on the glass in your aquarium. The highly porous ceramic rock has a very powerful magnet that is carefully embedded into the back side...
Tropic Eden Morroca Double Cave Rock - ONE x 4-5lb Piece | Premium Aquatics
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