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I'm really curious about the substrates you use and why you do.
Unfortunately I'm not able to set up a poll, but so far I'm aware of the following:
.: Agar (non-nutrient)
.: Filter paper
.: Kitchen towels
.: Soil, Bark, Twigs (Vivarium?)
I started with agar, but I find myself shifting more and more to filter paper.
Filter paper just gives me the impression of being easier to maintain and the slime looks healthier in the long term. Maybe it doesn't accumulate as much bad bacteria?
When part of the petri starts looking "unhealthy", I just cut that part off and replace it by fresh filter paper. The slime simply shifts from one end to the other and I'm able to keep that petri forever.
Agar on the other hand needs to be fully replaced at least once a week...
What's you methodology? Any tricks/tipps?