I was just reading through this whole thing and I’m kind of confused. Do the versions of the formicarium now have tile at the bottom or hydrostone or both?
Yeah, there's been a lot of changes over the years. If you are talking about the full sized chambers, they have a large round tile with Hydrostone covering it. The Starter Formicariums have never really changed. They don't have any Hydrostone; just a tile.
I sell both of them, even though I don't have any fungus-grower formicariums listed on my Market Place thread.