I think 5 gal is good unless you have other plans. I hear about the instabilities of the autos which I'm sure is there, but I do think there are some good genetics out there I have grown one and it went well wishing I had 15 more the same way in 3 gal bags. Maybe it's just the luck as well I dont gamble because I never win and I'm a sore loser. There free so really just out the time which you find out pretty stuck if there good or not