throw in as much light as you can get away with while still keeping the temps down to the correct range. id suggest having the lights more spread out as well cus right now your just lighting the back of the box. 6 might be too much for the space but this grow will give you very good experience no matter how it turns out.
a few things:
you should start in smaller cups till they sprout and throw out some good roots then transfer to your final pots. i think you went straight to your final pot size. youll get better root mass by slowly up-sizing the pot.
mount the lights up as high as possible, when the seedlings pop and you need to get them closer to the lights used a spacer(books, or something similar) under your pots to raise them up instead of lowering your lights to meet the plants. your growing in a small space you want to maximize the height your plants can grow to.
i dont see any intake/exhaust holes in the walls of your box, if its fully sealed and you only have a fan inside moving air youll just circulate hot air around. not sure of the temps in your box but looks like it might get hot.
you should invest in a thermometer soon.
if you plan on growing more out of the same set up i would suggest spending less on nutes and soil and more on the box for now. get the grow space right first then the rest will follow. good luck!
