so im about 2 1/2 weeks into flowering of my first grow, i only went with a veg state for about 4 weeks, pllants are good size, tallest is 3 ft. a foot of that grown in just about a week or so. basically looking for any advice on what i could of done better, as you can see in the pics they are loking pretty nice so far. Kinda spindly though, real long branches, almost too elongated. didn't know the strain of the seeds, but im guessing some sort of sativa by the lengthiness of the plants. Don't think im going to get much yield by the looks of it, i didn't do any pruning or topping or anything, i guess i was just to scared to that i might mess it up. anyway, any advice on what i should have done or could do to increase yield, and just be better for next time. Thanks!!

a few things about my set-up.
ebb and flow, with 15 minute on/15 min drain cycles pots filled with hydroton and nothing elsei use floranova (grow) a single airstone in the reservoir of 30 gal. 400 watt HPS, aluminum covered walls,