Looking at your old thread you got some less than choice advice. For starters, a 25 gallon is fine for a tuxedo urchin, especially with that much algae. Secondly, you posted your nutrients at 50 nitrates and 1 phosphates (I know this was awhile ago), you need to identify why they are so high. With so little livestock, at those levels with that algae, either you are way overfeeding, using tap water not RODI, or something else. You need more clean up crew. Get a conch, get 10 different snails, a few emeralds and see what happens. Remove what you can manually.