new 90g

[o2bnh20]

I plan on setting up a 90g mixed reef tank. I have a combination of 3 tanks now, mixed reef, about 90g total, that I have never used any filters before. Totally relying on live rock, a deep sand bed, and skimmer. 4 years now.

I have had problems with red algae for the last year or so that I can't get ride of

In my new setup I want to get off to the best start possible. I'm thinking about adding some type of filter system.

Let me hear your suggestions to make my new setup red alge free.