Actually, the white poofy balls in potting soil are bits of expanded perlite, not vermiculite. They are not fertilizers. They are basically little pieces of volcanic rock that have been heated and popped, more or less like popcorn. They just hold water. So I wouldn't worry about those being in there. But there are often balls of fertilizer that dissolve over time, and you have to watch out for those.
Dude, just listen to the people who say potting soil is generally a bad choice for something like this. We're not trying to tell you the wrong thing to do. Besides, potting soil isn't always cheap. You'd really be better off with some coconut fiber blocks and sphagnum moss. You can go to Lowe's and get a big block of organic sphagnum moss for like $3 and it'll last you forever.
Other than that, all I have to say is that you asked people a question, and when they answered, you either ignored their answers or argued with them. Your logic confuses me.
