[OCDP]

Oh yeah, forgot about the skimming... that will definitely help you out.

If your using true, pure RO/DI water you really shouldn't be experiencing such nutrient problems. You either feed too much, too often... have too high of a bioload for you to handle... or there is something feeding the nutrients... ie, phosphates and nitrates. But if you do use RO/DI and do weekly changes.. that should be sufficient.

I would get a skimmer (a good one..) and skim really wet for a while... feed less, (every second or third day) in very small amounts.

I use a 20g tank, and have had slight nutrient issues... but with heavy skimming, frequent water changes and small feedings my tank looks just fine without nuisance algaes.