Hi all, been Looking around lfs and realize that there's so many different types of gravel, some brandless and many in japanese. Been trying to find one that doesn't affect water parameters for my Sulawesi tank, and I read most people call it inert gravel.

So my noob question is, how do you identify which are the inert gravel and what brands / type to buy for a Sulawesi biotope?
I also don't wish to use so much coral sand that the gh goes skyhigh. And shrimp safe of cause.
Please do advice, will be greatly appreciated.