Aquatic Soil Recommendations

[Aquafish]

Hello,

I have 72 Gal Bowfront that I will be stocking with Discus and Cardinals. Right now, I think I want to leave it bare bottom but still want some plants to grow in there, like some sword plants...I know someone has planted these in clay pots. What I would like to know is what kind of Aquatic Soil did you use? Or is the regular gravel okay to use? If you have found something that works, please let me know.

THANKS:)