-Weekly water changes with the purest water possible (RODI
-Scrub with toothbrush
-Siphon/manual removal the most possible
-Nutrients control (maybe you're overfeeding)
- Cut back on lighting, depending on your setup, and light type and power. Consider running a timer on the light too.
-Nitrates/phosphates monitoring and control via accurates tests like RedSea.
(Granulated ferrous oxide in a reactor)
(Granulated activated carbon in a filter/reactor)
-Don't use canisters for filtration.
-Clean the sump/protein skimmer
-Vodka dosing (with wet skimming) if you have a double size rated skimmer.
-Change your salt for a higher reef salt grade if you're using a cheap one...
Also if your water is green, consider buying a UV
- Make sure there's no direct sunlight on the tank at any moment of the day too...