1 st timer

just like to say hi to everyone. Im brand new to growing. Please comment my plants, im only going by internet learning. Im in Ny for weather humid season info, but shouldnt matter as im indoors dwc 2 1/2 gallon dwc. Im using 400 watt hps and the largest size cfl from home depot. For food im using schultz 10-15-10 and a pinch of super bloom. Im 3 week into veg and about 15 inches tall and vary bushy. Its cali big bud and I transplanted it from dirt at my friends house to my dwc. The strange thing is after i did the transplant it looked like it died, and out of the center popped 3 new branches and they all seem to be doing excellent. So any comments or advice would be greatly appreciated. Nice to meet you all.

Just some more info. Im runin tap water but its the best in the area. It comes at a ph of 7, and I played around with it by trying lemon juice, It worked but only for a day or 2 then back to 7. I change the water every couple of days and lights on almost 18 to 20 hours a day for vegging, is it worth it to buy ph down? Should i get it and maintain a 6?