indoor?

this is my first grow and ive been growing for 4 weeks indoors from seedling start inside of a fish tank, there are 8 plants and i use two 65 watt plant lights ans one 70 watt plant forecent light, can i use this for all stages? i just started the flowering stage 2 days ago when there were 8 inches because i dont have to much vertical space, i know i have enough space for them to grow till harvest, i use the right nutes i know from reading so much , right now there 8inches tall, i could use any advise i can get plz help thanks