Hi yuzz, I think it will help if you cycle ur rocks properly before stocking. My rocks in the tank now were filled with LR from my previous setup, and new rocks I actually bought dry/dead rocks from fellow reefers, then bleached, dried, soaked and then kept running in a 60l drum filled with my tank water (which comes from the 40l of water that are removed weekly during water changes) for 8 weeks before they went into this current tank. I suspect this could possibly be the reason I don’t have brown algae on my rocks as they are populated w bacteria and cycled when they are introduced. But I still have diatoms on my sand which I remove with a gravel cleaner upon advice from subzero. [emoji4] Hope this helps Sent from Singapore Reef Club mobile app