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Re: RO water and algae

Matt wrote:

<big snip>

>I fertilize with CO2 (about 15 mg/l), have a pH of 7.0, GH 9, KH 5,
>Fe 0.5 mg/l, Phosphate 0.2, and Nitrate 0.

<big snip>

Matt, your iron concentration shouldn't be any more than 0.1 mg/L,
and some of us think that even this is too high.  Your big problem
however, is your nitrate level.  Zero nitrates is not a good situation in
a planted tank.  You must have some nitrate residual or the algae
will exploit the nitrate-limited conditions in your tank to the detriment
of your plants.  I used reconstituted DI water for a while and had
lousy results because I ended up with 0 nitrates as well.  Since then
I've switched back to tap water or a combination of tap and DI.
Since there is about a 5 - 10 mg/L nitrate residual in my tap water
the plants flourish and the algae has been kept in check.  To remedy
the situation you can either increase your fish population or add a
nitrate supplement such as KNO3.

Jonathan, in Maryland where we are about to receive some sorely-
needed rain and where the deer ate all of my tomatoes this

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