In article , Justin wrote:
Hi all,

Just a question on this... I'm getting green spot algae on my anubias and
also my sword. I thought that it was to do with my MH lighting being too
strong and maybe too many nutrients... Is it as simple as adding more PO4?
If so, what level should it be? I was always under the assumption that
PO4=algae... Same as Nitrate... Is this wrong?

Very. Nitrates can be through the roof with no ill harm to anything. It's
ammonia that's the killer, not nitrates.

A lack of PO4 causes green spot algas. Too much PO4 does not partitularly
cause algae, only in the presence of lots of ammonia. PLant calls can
use all that PO4 without a greater amount of N.

Some people say .5 - 1.0 ppm phosphate, other ssay 3ppm. I fall
in the latter camp.

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