I recently cleaned my pentair UV filter and that seems to be working to a limited extent. I think I am going to try adding the extra Aqua 15 watt hang on UV filter I have for a few days to see if that helps as well. I am also going to start manually removing the brown areas and continue adding Microbacter 7 daily. Given that my nitrates and phosphates are not at 0 levels, those steps seem to be what most people are recommending online. If the above doesn’t work, I may try a 3 day blackout period, but I hope to avoid that step if possible so as to limit harming any coral that may be sensitive to that measure. Any additional thoughts are most welcome. Thank you!