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Re: Dana's question/hardness

> I have a neutral ph of 7.0. I inject CO2, and add PMDD daily to obtain an iron
> reading of around 1.0ppm.

Dana, you should keep the levels down for Fe to around 0.1ppm or 
less. Maybe the high Fe levels could be affecting something within 
the plants. I know from experience that lots of Fe will help get you 
lots of algae, so beware.
The dK and dH values look pretty normal. 
Jamie Johnson         "Keep your eyes on the stars
Chemist-Trace Metals   and your feet on the ground"
Davis & Floyd, Inc.            -Theodore Roosevelt 
jjohnson at davisfloyd_com