I don't see a need to throw out the jar with a mushroom in it. Any naturally planted terrarium / vivarium will go through a high nutrient cycle upon start up. Just like a fishtank does as the "miniature eco-system" inside the small environment equalizes itself.
I had a variety of mushroom species come and go in my Anoles vivarum. Now they never come and I sort of miss seeing them pop up every so often. I had fat orange hairy ones, tiny white ones, some tall skinny blue looking ones... Something that looked like a whitish clear sea fan grew all over the glass at an alarming pace for a few days a couple years ago and never saw it again. Once the bulk of the available nutrients are gone so too should be the fungi and molds. In the mean time I say enjoy the show!
If you're old enough to buy beer, put some in a bottle cap and put it in your tank. Snails (and slugs) drink the beer and die. Certain snails can eat on good plants so it's OK to be ruthless with them. In the case of a planted aquarium the snails known popularly as Malaysian Trumpet Snails (these look like tiny white and brown unicorn horns up to 1" long) are great detrivores and a real asset to have. But I don't like Ramshorn Snails (the curly shelled ones) on land or in water, as they can do some damage to your good plants. I've never tried to see if MTS can be kept in a moist non-aquatic environment, would be cool to have some in a terrarium setting to work the soil processing the dead leaves and so on like they do in a planted aquarium.
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