In this project, I worked on several types of mold that have the ability to grow (of course in SBSAR format :)), so if you need rot and decomposition in the environment you can check it on my store: https://artstn.co/m/6NAW7
This is rendered in Substance 3D Stager. (3D model downloaded from Megascans library )
But the Petri dishes are rendered in Marmoset Toolbag.