How big do you intend.letting your girls get? 10g sounds a little small for four but its all relative to the size you want to take them... I have a long 35ltr storage container that I put in 3 sites, representing 2 week stages, then I have anotheranotheranother 2 separate pot like totes 30ltr? For the last four weeks... So I've got 5 girls in flower constantly...