So, I got this for free,
but I don't know exactly how to prepare it.
It has been soaked, weighted etc by former owner, but it was with a bunch of fish in an unfiltered tank, so... yeah, probably has some stuff in it I don't want.
How to make it safe for my tank? Do I boil it? Put it in a tub of hot water?
Will it raise or lower my PH?

but I don't know exactly how to prepare it.
It has been soaked, weighted etc by former owner, but it was with a bunch of fish in an unfiltered tank, so... yeah, probably has some stuff in it I don't want.
How to make it safe for my tank? Do I boil it? Put it in a tub of hot water?
Will it raise or lower my PH?