I concur with ryker,, you will need to transplant.. and your water8ing method is unorthadox... but it is wrking for you!!! the plants look great. The tell tale sign, i s that each new set of leaves is better than the previous set.

You will need to flower soon...

Are you going to take clones?

If not, you should transplant now.. and flower in 3-5 days..

I reccomend this based on your height restrictions.. If you are using and HPS.. you still may be able to keep them under 2-3 feet.. plants double and triple in size when flowering is induced

If you are using CFL.s, your fucked.. ehehehe

NICE plants