Whatever you decide to use...trust me here...

Buy some of the small RED lava rocks.

Line the bottom of your container with it.

It promotes oxygenation in the soil.

It is incredibly rich in minerals.

It aids in watering in so many ways:
A) You can bottom water
B) You can extend time between watering
c) Roots will continue to grow where just soil the will not.
D) Waterlogging is not possible.

You ideally can use many types of gravel, but I have found lava to be the best...mainly becuase of its mineral richness.

You simply wont have mineral problems with RED lava rock being used in your medium.
HARDDON Reviewed by HARDDON on . Help with Soil Medium... Please I have searched the forums and done some research. I want to start my second grow. My first grow was ok but I found my plants stayed water logged for too long. and I believe this hurt them in the end. I used Coco and Hydroton rocks and dolomite lime. I want to use somthing diffrent this time. Or well somthing that will work better than what the guy at the store told me to use. I now realize I think he was just trying to sell me shit when he told me to use the rocks for air in th soil. Rating: 5