Hisserdude you were right, they were mushrooms.
Picture of what I plucked out
I just plucked this from my isopods enclosure. I am not sure if this is the same species as the one in my roach enclosure. It seems like the last time I serviced my isopods, which is admittedly a while ago, this was not there. The funny thing is I keep reading about how isopods love mushrooms so maybe one would choose to leave something like this in. I didn’t want to take any chances so I got it out of there, but found a few of the dwarf isopods on and around the mushroom.
I continue to get them out of my roach enclosure as I see a build up. I think I will change out the substrate soon.
Anyone know if freezing the substrate works as a way to sterilize it?