Four is better than none. Don't get frustrated, hopefully the four will be female. You could yield at least two ounces with four plants in the small cab ya got, probably three if you do it right. I never introduce nutrients so early since I use Fox Farm Ocean Forest soil, which contains all the goodies for at least a month or longer. Plants really don't need a a lot of extra nutrients until bloom, especially if you start 12/12 early. I use the kiss method, keep it simple stu..., LOL. Good luck and let me know if you have questions, I have done three indoor and two outdoor grows, all successful bagseed. Check out my pics of outdoor on my profile, peace!