Reef Aquariums (hard corals) LPS and SPS corals

A reef aquarium or reef tank is a marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the tropical coral reef environment. A reef aquarium requires appropriately intense lighting, turbulent water movement, and more stable water chemistry than fish-only marine aquaria, and careful consideration is given to which reef animals are appropriate and compatible with each other.

LPS stands for Large Pollup Stoney corals and SPS does for Small Pollup Stoney corals.