I found that my red algae problems always hit me when I start a new tank with insufficient water flow in it. What do you have as far as powerheads or pumps on this puppy?
So far so good by the way, your tank is coming along great. Your starting up a nice base for your reef tank to come. Ideally if you had all the money in the world, what would you want? Once you have that answered, slowly work towards it. Good luck !! :happyfish