Bashsea's proprietary design helps with natural water flow through and under the rack â creating a cleaner environment that produces faster, healthier coral growth. This âhigh-flowâ design was developed around the needs of the coral professional. Variable gap holds coral plug in place while still allowing sufficient flow. Specific spacing is proven to promote coral growth while visually aligning and organizing coral plugs. For salt or freshwater environments. Commercial-grade durability & craftsmanship. Superior quality build materials.