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Antimicrobials for Blue Green Algae Control?

In a message dated 12/29/99 12:57:08 PM Pacific Standard Time, 
Aquatic-Plants-Owner at actwin_com writes:

<< This may work in France (or Mexico or Japan, etc.), but it won't work in 
 America.  You can't buy Erythromycing from a drug store without a 
 prescription.  However, it's available in veterinary form from any of the 
 fish supply catalogs or stores.  In fact, Maracyn I is nothing more than 200 
 mg of Erythromycin.   >>

Actually, most pet-fish people will show you where/how you can buy 
Erythromycin under that name or the original (1969) product of Mardel Labs 
Corp... Maracyn... but, please don't go this route (algae/cyanobacteria 
"control" through antimicrobials)... Instead, do look to the root causes of 
these outbreaks... usually too much nutrient, too little light and/or 
circulation... otherwise "out of balance" situations that need to be adjusted 
to the advantage of your vascular plants.... Many downsides to relying on 
Erythromycin... Treat the causes, not symptoms.
Bob Fenner, who finds himself surprisingly opinionated at this time/place