FF cultures molding over

[Evaradero]

I just had a recent FF culture crash and while cleaning them out, saw a mold growing over the media. I normally add a tea spoon of vinegar to my cultures to fight mites and possibly mold but am not sure why my cultures molded over. Ive never had this problem

[Philsuma]

What is your media composition? Ingredients or commercial mix?

What type of container...glass or plastic? What size? What type of lid?

Anything else added, like excelsior or paper ect?

[Evaradero]

Media consists of potato flakes, powdered sugar, and a bit of yeast. I buy it from a local frogger in florida. I use 16 oz plastic deli cups with the breathable lids (holes in it with a coffee filter on it) and i use excelsior

[Philsuma]

Sometimes excelsior is the culprit. It's basically wood, and as such, can develope mold spores if stored in damp places ect.

Mold is common on older,less active cx's. I only get nervous if the black mold appears on fresh cultures. Maybe add a little bit more vinegar or try some cinnamon. Just gotta experiment a little.

[Evaradero]

Yeah i may even microwave excelsior to kill possible mold spores. And ive never heard of using cinnamon before