As long as you keep an eye on the roots, and follow mackswells advice. you should be OK. The whole idea is that you can push the veg time of multiple plants, but you must be wary of root tangle. With that said. give it a try. Although I generally advise against multiple dwc vegging for the well being of new growers. I must admit, I multiple veg all the time in dwc to keep up with my perpetual grow...I run out of drip sites and have to put overflow into dwc tubs. goodluck

As long as you are doing clones...You could just veg 4-6 in a big tub...You can leave them in a tub for entire grow. Awhile back I grew 4 clones in a 4 top 10g tub and yielded around a 1/4lb.