Mainly looks, and like BDAWG said it covers rock where bad algae could grow.
- 2 Percula Clowns
2 Emerald Mithrax Crab, 5 Nassarius Snails, 3 Astrea Snails, 1 mexican turbo snails, 1 Chocolate Chip Star, 1 Peppermint Shrimp, and 27lbs of LR
2lbs tonga branch and 25lbs fiji rock
Maiden's Hair, Calerpa, and Red Kelp macro algae.