Any one done this method
Sorta... the idea being to just have fully cycled tank before planting. I've kept substrate in a bucket of water for a few weeks before using. So long as there was ammonia in there (old substrate, active substrate, or added) and you keep it wet then your bucket of substrate will be cycled before using. I've done this, it works fine and definitely had fewer bumps in startup. The idea being to just not have so many swings in water parameters or need to do as many water changes.