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Re: Surface scum

> From: George Booth <booth at hpmtlgb1_lvld.hp.com>
> Subject: Re: surface scum
> So can folks corrrelate surface scum with iron additions; perhaps even with 
> specific brands of fertilizer?  Do tanks using PMDD get it? 

	I have never used "PMDD" as the mixture, but do use the method,
and have seen surface scum, of a bright green variety.  I have never
managed to correlate it with anything in particular.  I don't have
any at the moment.

Paul Sears        Ottawa, Canada