I started this Early Girl Tomato plant from a clone in rockwool and put it in this deep water culture hydroponic bucket 10 days ago. It took about 4 days for the roots to start to come out of the bottom of the 6" netpot on the top of the 5 gallon bucket. The bucket is only half full of nutrient solution because the aerator I have hooked up is mighty powerful and really splashes up. Right now I have the nutrients at 1000PPM of Maxigro and the plant is really starting to take off. I have never grown a hydroponic tomato outdoors, just indoors for the past few years. I have done hydroponic bell peppers outdoors before as you can see in the photo below. I'm still using the same unit today. They really last.
Below is a photo of the Early Girl Tomato root system. Very healthy and white. Looks like fish bones. I'll keep updating on this plant as it grows.