Chloramphenicol or Streptomycin?? - (Mar/21/2018 )

I want to reduce bacteria in my petri dishes, because often they overgrow my fungi. What I should use Chloramphenicol or Streptomycin? Or there is no difference?   

It's common to use a mix of penicillin and streptomycin for inhibiting bacteria in cultures.

Thank you! I will try to use penicillin and streptomycin