Coral food
In natural seawater, corals benefit from the abundant presence of zooxanthellae and planktonic material that offers them the nourishment to live and grow. In the modern Reefkeeping practice that intentionally reduces the presence of organic nourishment, this lack of nutrients can impair the presence and growth of zooxanthellae, and unfortunately, can take the life of corals and the entire aquarium to a delicate and precarious equilibrium.
On the opposite, feeding your corals with un-proper food can easily increase the level of nutrients (NO3-PO4) thus making our colorful tank become brownish.