Ah, the green stuff. The miracle cure, the lifeblood of a reeftank, the savior of fan worms and clams of all ages... Or maybe not so much. Could it be that phytoplankton actually does more harm than good in a reef aquarium?
In the ocean there is a lot of phytoplankton and it's crucial to the ecosystem. In the ocean. In your tank, however, phytoplankton dies and fouls up your water quality. I mean let's think about it, you're pouring live green stuff into your tank where chances are that only a miniscule part of it will be used for food. In fact, it is arguable if any realistic part of it will be used for food by your tank's inhabitants.