This Frag Plug Island Sandbed Frag Rock was made to safely hold 6 frag plugs in a aesthetic and pleasing manner, that is not obtrusive to the eye. Its great for those who dont want to add an unsightly, and unnatrual unrealistic plastic egg crate of frag rack into your aquarium. This rock looks and feels natural and will blend into your aquarium scape. you have the ability to mix and match colonies to great a garden of your favorite corals all growing out of one rock. the best part about it, is it is elevated from your sand bed in a natural way, and will not topple or get buried by the sand. For added permanency, we suggest adding a bit of coral gum, coral epoxy or coral glue, depending on your prefrence.