In article ,
Robert Flory wrote:

"Elaine T" wrote in message news:vlmId.13778
The red colors on your plants are from the light intensity. That's one
of the really fun results of high light intensity and good amounts of
iron. Spot algae is one that likes high light intensity, which is why
you're seeing it now. I'd actually try dropping the nitrate rather than
increasing because you have a lot of fish in the tank, but don't drop the
K.

Actually the reds may be a sign of nitrate deficiency, or so I recall seeing

Absolutely. Add nitrates and plants become more green. But red plants are always red,
this isn't going to turn them all green, just a bit less red.

Conversly you can redden up your plants for a picture by restricting nitrate.

Green spot is the easiest alage of all to get rid og. If you have it it
means you havn't spent $15 for a cheap phosphate test kit. Scrape off the alage
with a single edges razor blade, then dose wirh 3ppm of phosphate. You'll
never see it again if you maintain this level. Tom Barr taught me this not
long ago and I must say it works as described in my tanks.

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