Grind and smash the Coralline algae
Not sure if it works but I get some coralline algae from a variety of other fish tanks and stores. they scrape the glass and I take the coralline algae smash it and grind it into a million pieces and spread it all over the tank. I heard that different types from different places mixed together is a good thing. Been doing it for years. Also I too have 2 large Urchins and they can't keep up.
Magnesium is dosed and use lots of purple up.
Hopefully this helps
thanks
erick
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