Brown algae...where? On the sand mostly? Probably diatoms. They are the first sign of a nutrient problem moving in. No matter what test kits say, if there is algae there are nitrate and phosphate in the tank and the algae is feeding off it. Cyano is dark red and slimy/stringy and often has "air" bubbles in it.
The original question, how effective is Chaeto? It can be very effective when employed properly, but most people don't set it up very well.
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~ Mindy
SPS fanatic.
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