I had a major algae problem in my 40 gallon. Changed di cartridge, fed mysis and new life spectrum since my old foods had phosphates. Even though LRS Reef frenzy is clean a lot of it is uneaten and brine had phosphates so switched from those. Did 25% changes every week instead of 10% to help dilute the phosphates. Added a sally lightfoot and an emerald crab, added a sea hare for now. But food was the main issue, get a good cleanup crew like hermits and trochus snails. Tank went from hair algae and bryopsis central to rocks that were clean as a whistle