I used the soil from the previous growth - 5l and mixed new 5l(Atami Janeco light mix) into which I mixed biotabs nutrients plus biochar 0.5l and perlit 1l.
Nice looks so similar to mine in that stage. I got a White noise going in a similar set-up. 10 l soil in 12,5l airpots and biotabs as well. just flipped 12/12 a week ago.