Nearly time to get my second grow started, and I'm considering air pots rather than the square 11 ltr pots I used on the last one - I think 11 litre was maybe a little too big for my very small tent (60x60x140cm) as the diesel automatic was getting dangerously close to my lighting by the end. So, would getting some 6 litre air pots be sufficient for growing 2 autos in a small tent? Or should I go for the 10 litre version? And more importantly - are they worth the cash, is there really much benefit to using them? Anyone with experience using them, advice would be much appreciated 