I want to isolation pure culture of cyano , I used the BG-11 media but grow with cyano different type of bacteria (contamination), recommend me to use agar agar powder , how this is work?
You question reads as if you have little experience in microbiology. No problem, but maybe read up on it before you start this.
Prepare plates with BG-11 and 1.5 % agar (google "making agar plates") and streak your culture on the plates. This might give you the chance of isolating a single colony that can then be used to grow an axenic culture. Get help from a microbiologist. The procedure is simple, but has a lot of pitfalls if done for the first time.
I wouldnt go for BG-11. It is a nutrient reach medium. Instead go for a minimal nutrient medium and grow in light. Then, during exponential phase you will obtain more cyanobacteria on the expense of other not light harvesting microorganisms.
But ... You will need more steps. The most common is dilution protocols and growth on mixture of antibiotics which kill bacteria but cyanobacteria are somewhat resilient (to some extent) to them. For example see this paper:
https://www.frontiersin.org/articles/10.3389/fmicb.2015.00799/full
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