I only have seen it in my 20 gal long tank. When I have a little bit show up, I pick out as much as I can. Then I reduce light levels or photoperiod, reduce fish feeding, and it eventually goes away, over a week or two. Last time I had a big outbreak used erythromycin. That worked very well, but is only practical on a small tank unless you can get it in bulk. It's too expensive at retail. Lights out would have worked too, but I had never tried erythromycin and wanted to be different. Keeping nutrients properly balanced as Roy explains is something I'm going to have to try too. On Sat, Jan 9, 2010 at 4:57 PM, Seattle_Aquarist < Seattle_Aquarist@comcast.net> wrote: > Hi Shango, > > I got rid of mine by removing as much as I could manually. Then I dosed 1/8 > tsp of Potassium Nitrate (KNO3) per 10 gallons daily. I did a 33% water > change weekly. It took about 4 - 6 weeks to get rid of it. My BGA seems to > show up when I let my nitrate level drop. > > Roy > > BTW, this same procedure has worked for other members of GSAS. > > > > _______________________________________________ > GSAS-Member mailing list > GSAS-Member@thekrib.com > http://lists.thekrib.com/mailman/listinfo/gsas-member > _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member