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Hairgrass cultiv.

    To Mr. Barr,
    You recently reported excellent growth of hairgrass under a variety of 
conditions.    Great!      Wondering about a few things, if you'd be willing 
to share some more details...
    Is the hairgrass in the 5w/g tank that you mentioned, growing in plain 
flourite?  Do you find the need to substrate-fertilize the flourite for 
hairgrass or glossostigma, when there is high light such as this?  How about 
at lower light levels?
    Under high light does the hairgrass stay lower, or will it still go 
    Also, what co2 concentration (ppm) do you prefer?  Do you vary it 
depending on light level?
    Zach K