YIKES!!!
Probably a LEO posted that video to keep us from growing herb. That's garden bark mulch. NO NONONONO!!! Use hydroton pebbles instead.
In fact, hit that link in Weedhound's siggy and read it start to finish. Then read her other logs. THAT'S how to grow pot in a 5 gallon pail hydro system. For your dirt plants, hit the link in my sig, and read it all.
Never put more than 1 plant per pot.