"Happy'Cam'per" wrote in message
...

Where do you think it came from in the first place? Once you dose those
anti'B's you're going to kill alll the Cyano cells but the conditions in
your tank will remain the same, they will return once the AB's wear off.

According to Tom Barr, a common cause of BGA outbreaks are too low
levels of NO3. Do the five day black-out thing, turning off CO2 during that
time, and don't fertilize for those five days either. Then do a large (50%)
water change, and dose 10-15ppm NO3. Keep CO2 in the 20-30ppm range.
Apparently, that puts paid to BGA.

Cheers,

Michi.
--
Michi Henning Ph: +61 4 1118-2700
ZeroC, Inc. http://www.zeroc.com