Bacillus & E. coli

This is the Bacillus species microbes
In rod shapes and grams positive

This is the E. coli

Clearer after adjust the contrast.

And this is the magnified version.

Basically now I am doing research on fermentation material for certain microbes.The material need to be cost effective and provide high colony count. Any suggestion??

This one is still unknown
Maybe yeast species?
The colony formed is widely spread on the Agar Plate