"Dave Millman" wrote in message
...
Graham Broadbridge wrote:

Most tanks are not short of nitrate. Tanks that are short of nitrate
normally have lots of light ( more than 2-3 watts per gallon of
flourescent
light) and injected CO2 at around 15-30 ppm CO2, and lots of
fertilizers.

Graham, your statement is generally true of tanks with fish, but because
Shawn
has the green water, he is more likely in the low-nitrate category than in
the
"most tanks" category you describe.

I'm not sure that follows :-) I've seen green water in tanks with 10-50ppm
nitrate.
Probably Shawn should test the nitrate level before deciding on a course of
action.


Graham.