" wrote in message
om...

If you raise the CO2 to 20-30ppm for the entire photoperoid and keep
it at that level consistently, BBA will stop growing. Try it. Then you
can see for yourself and stop going on a wild goose chase.

Okay Tom, I'm always open to an experiment :-)

My 55 gal is phosphate 0ppm , around 2ppm Nitrate (due to addition of KNO3
as required). CO2 is around 20ppm by calculation.

I still always get some beard algae growing somewhere or other.

I've just increased the kH to 10 dgh in order to obtain 30 ppm CO2.

I'll lete you know the results.

Regards
Graham.