Hello Perumal

BG-11 liquid media is  mostly used  for algae and cyanobacterial biomass production. It is well practiced.  There are no. of factors which affect the growth of cyanobacteria.  For max. biomass production you can optimize amount of  nitrogen and  use buffer to maintain the pH of media. That will give you best results. Good luck.   

lots of good recipes available--try algal culturing techniques by andersen

Dear Nitin,

 thanks for your answer. it is useful to me.

i am also using BG 11 for Blue green algae. but i wish to get some special medium which is especially used for Arthrospira and Microcystis. 

Thanks and regards.. 

For Arthrospira use Zarrouk's medium and for Microcystis may be BG11.