Good substrate for my Lasius colony

[Diamondking]

So, I’m moving my Lasius colony into a deluxe ant tower. I need help figuring out what substrate to use, and if I need to bake/freeze it like other sources say. I’m really new to this and any help is appreciated!

[Jgibbss]

Use any type of soil could be bugs attached orn parasites try getting a pan ant have it heated for a min then add it wait for it to cool or go ahead and freeze it (freezzing is a safer method)

[Hawkeye]

Wouldn't microwaving it for a couple of minutes be just as effective?