Why put auto in 20 gln soil. Think that autos would be just as good in a 5. Day 50 on these two. Did three gln last grow so now did five gln so I can compair the yield weights. Honestly looks maybe just a little more than the threes have done so rather use less dirt get more plants in the grow space. Curious to let me know the yield weight. If enough then may try a 20