silica
I've proven that if you dose silica, you can grow diatoms. This did make the tangs happy as they are back to grazing the rocks again. Unfortunately, growth of diatoms hasn't caused the cyano to slow any....I just got both.
So I'm temporarily suspending the silica experiment until I can get the cyano under control.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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