zooxanthellae protect corals from uv
lights, adding uv
into the mix will produce more zooxanthelae, causing competition between the zooxanthellae and the coral to compete for nutrition, which could cause the coral to become undernourished. The increase in zooxanthellae population also causes the corals to become darker with a deep brown tint that obscures the natural pigment of the coral.
at least that's what my reading has lead me to believe, we already have a an overabundance of algae nutrients in our tank which can also induce an over-density of the zooxanthellae populations, adding uv
into the mix will just add to a problem.