Need a lil help... 2nd grow,ne on have advice..

PLAnts are in a 2x3 growing spcae with a 100 wat MH light i also have a HPS light and ballast..( plan to use during flowering..) what are the benefits of using both MH and HPS at the same time?...
I was told on another forum to put them n2 flowering phase already? What should i do? i know they're big but they were planted only on the 4th of october...

i dont use any fert right now.. the mix i used was a 10-10-10 solution i think it was called vigro.. i corrected the pH. When i tested it it came out to be around 7.6! Now im just going to wait and see if that was the problem.

Here are a couple of pics of the plants... for the most part the plants are doign healthy and growing like crazy.. ;) any comments on how the garden is doing at day 25?