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Re: Aquatic Plants Digest V3 #1151

We had the same problem.  We treated the tank (55 gallons) with 200 mg
/10 gal erythromycin for 5 days.  It killed the cyano quickly and we
have not had trouble with it coming back (it has been 2 weeks). However,
watch the ammonia level... it shot up to 0.6 ppm after treatment.  We
changed the water and added a solution that binds up the ammonia.  The
fish seem to be happy and the plants are growing "like weeds".  ANGELA

Date: Wed, 14 Jul 1999 09:24:57 -0400
From: Alok Chaudhari <chaudhari.6 at osu_edu>
Subject: Cyanobacteria

        I seem to have a really bad case of cyano. I have read
about using circulation, erythromycin, darkness, witchcraft, among other

things to get rid of the stuff. The most possible explanation for the
outbreak is what some people have discussed, nutrient starved tanks can
have bad outbreaks. I use reclaimed RO for water changes (25% weekly).
tank is a 180. There is about 5 mg/l NO3 and no detectable PO4. Any
suggestions would be greatly appreciated.