Y'all are makin my head hurt. It's like a tablespoon of lime per cubic foot. Ask Stinky. She'll be able to give you specifics. I'm just a dork.

However...in my experience,(just my experience! don't take it to the bank!) OF doesn't need additives unless the pH of your H20 is wonky. OF seems pretty balanced on its own. And yeah, make your mix 30% perlite. That alone takes care of a host of issues.

Stinky c'mon, I'm drownin' here!