
This white hairy organism was not there yesterday, and today it’s about 3” in diameter. This is a 20g terrarium with mosses and ferns. I added springtails and isopods on Thursday. It’s only been set up for about a week and a half. Can anyone educate me on what this is, whether it is harmful or helpful, and how to support or eliminate it as appropriate?
by avalorg356

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Looks like hairy shit mould, scientifically known as Phycomyces blakesleeanus.
Typically grows on shit.