@DaDude ,
there is a smaller pebble 4 mm, that is available. Try for that.
We made our own 8 mm.
Image below.
Good Day
Anthony
This a willow leaf type ficus, local. Does not like a lot of water.
The test --- hand rolled balls [ ball bearing principle ] and aged compost.
The tree and still having problems slowing down the excessive trunk thickening
This willow leaf ficus was grown to the trunk size seen here, in 5 mm silica based gravel
and aged compost. By volume [ spadefuls] in this pot only.