|This rock will be different because we are using the bottom of a large soda bottle. We have prepared it by coating it with Aragocrete™ and CaribSea gravel. We want a deeper cup to hold a larger clam or more cuttings. These cups work very well for Ricordia cuttings. You place the cave rock where the current is just strong enough to not move the cuttings. You can adjust the current by turning the cave so it blocks the water flow.
We have placed our base for this cave rock by pouring 3 cups of mix on the gravel. We push the cup into the mix so it will be level with the opening on the cave.