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Unread 01/09/2017, 07:19 PM   #11
bertoni
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,616
All of these products are forms of GFO:

http://reefkeeping.com/issues/2004-11/rhf/index.htm

They might be able to lower the phosphate level in a system low enough that corals have problems growing. That seems to be have happened to a number of people, although it's hard to know exactly what's happening in our systems.


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Jonathan Bertoni
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