11l or bigger if you can,I use 11l in a90x90 tent and this works pretty well,in a 120x120 I would use a15 or 20l pot,outdoors I use a 60l square fabric pot for 4 auto’s
The only thing I don’t like is the biobizz soil,I has far to much large wooden stuff in it,I prefer the bio nova bio soil or the plagron light mix for auto’s..and for the nutrients I don’t know,never worked with them before but a lot of people use them and they are around for a long time now so they will do good things for your ladies
Happy gro