Feeling kinda defeated

When I had a bit of a bryopsis issue once, some targeted peroxide seemed to help a lot, but it was really only a few isolated areas. I have tuxedo urchins as well and love them, but in my experience pincushion urchins will decimate most algae in a way the tuxedos just don't. Bit of a nuclear option because they do chew straight down to bare rock, but they've done a good job for me at getting rid of everything from algae to vermetid snails at various points over the years.
 
One thing I haven’t seen talked about yet is your water and lighting schedule. You said 10% water changes. Are you using rodi water? And have the stages been changed recently? That can also contribute to a lot of algae. Hydrogen peroxide is a good move also. Add a large clean up crew and turn lighting schedule down and the amount of time
 

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