I presume that your bulbs are just a couple months old as well so it should not be color shift. How were you lighting the tank before? How long are the lights on? What size of tank do you have? How are you filtering it? Do you have LS and
LR and if so how much? What are your
NO3 and
PO4 levels? Has anything i.e. new fish, different food, new salt, different additives, etc in the tank changed in the last few weeks? What fish, corals and inverts do you have? Has anyone gone AWOL? I know it seems like 20 questions but they will help us find the reason for the algae. And, like Joe said, algae is a part of reef keeping although having it come back within a day seems a little excessive.
