First indoor grow, couple questions.

Hi guys n' gals, this is my first indoor grow and I got a couple questions I was hoping someone could give me some help with. First off I have a 4x4x7 tent with a 600w hydrofarms hps lighting system, bulbed with a plantmax 600w Metal Halide conversion bulb. Got 2 table fans going and a 4" inline exhaust fan hooked to my lights hood to exhaust excess heat.

Ok on to the questions, first I have my plants in 2.5 gallon buckets, they are almost 4 weeks old and I have 3 G-13 Pineapple Xpress and 3 World of Seeds Yumbolt-47 plants. Today when I was watering I noticed that I can see the roots of the plants through the bucket and they are every where in there already, do you think I need to transplant or will need to soon? If so how big of a container should I go with? Thanks guys.

from 2.5 gal i would go to 5..it wouldnt really be worth it to just go to a 3 gal.

So you think I should transplant to 5 gallon buckets. Cool, I appreciate the advice man, guess I'll start rounding up some 5 gal. buckets then. Thank again.