The Tunze Delta Rock is an interesting take on the typical corner frag rock. Designed with a cup on the top and to fit into a corner, the Tunze Delta Rock gives you some flexibility in what you do with it — a great anchor point for a large coral colony, fill it with sand or substrate and use it as a planter for mangroves, and more.
The porous ceramic stone has plenty of nooks and crannies to host beneficial bacteria. Plus with and two large sealed magnets means it can stick on glass or acrylic up to 1/2 in. thick.
The Delta Rock measured in around 6.9 x 5.9 x 8.9 in. and will set you back about $115-120 USD.