mine roots like crazy in just flourite it rooted like crazy. i have dirt with flourite cap right now.
no root tabs either just api iron and potassium and flourish
i cant even say enough good about flourite. every plant i ever had rooted so thick in this stuff its like super soil. if you want to start a tank with it just mix your water ferts in a bucket with the flourite and it will absorb it and be fertilized let it sit over night and then plant a tank works great