I am examining the presence of lactobacillus in a commercially available kombucha sample. Following serial dilution upto 10^3 because above that dilution no growth was observed. I had tried the experiment multiple times followed by gram staining I get red rod shaped bacteria and dark purple yeast. Can any one give the reason why?.

Kombucha pH-2.7

Incubation period - 48-72 hrs at 30•c in a candle jar.