Reef Casa foundation rock are easy to scape, small flat piece of rock that make the perfect rock for aqua scaping and setting up your all in one aquarium. They come in random sizes ranging from .5 to 1.5 lbs. Use this rock to scape your all in one aquarium, give a place for fish to live and a spot to mount corals. Benefits of stax rock Ecofriendly: Not taken from live ecosystems like traditional live rock Pest Free: 100% pest and hitch hiker free Cost: A third of the cost of traditional live rock Clean: Will not released any ammonia, phosphate into your water Aesthetics: Looks exactly like live rock and will turn purple with coralline in no time All in one aquariums need live rock as an integral part of the live filter