I tried growing tomatoes indoors in DWC.............Dumb Mistake. They don't make male and female tomato plants like they do pot plants. You need BEES or Butterflies to polinate them.
I am 60 years old and have grown tomatoes outdoors for 40 years, every year. I've had my garden and tomatoes in a magazine and in the newspaper becasue of the success and size.
I first buy LARGE plants, at Lowes or Home Depot, at least 18 inches tall. I buy BIG BOYS and BETTER BOYS.
I dig a hole big enough to bury a BIG dog in, like two feet deep, two feet wide, and I leave that dirt on the side of the hole. In the hole, I put half Peat Moss and Half Top Soil, or Potting Soil. I used to put lots of COTTON Lint that I got from the local cotton mill but they have closed. Now I use cottom from an old pillow, mixed in well. You can use some foam rubber from a pillow, it is to absorb and hold water in the hole, 24/7, and it keeps the soil from packing or hardening. I add a small amount of rotten cow manure and mix it well in the hole.
I plant the plant HALF way in the hole, covering HALF of it with the fresh soil mix. With HALF the plant in the dirt, and the dirt very fertile and very loose, the roots will grow two feet wide and two feet deep, and give you a giant plant with giant tomatoes.
I do also add a little Liquid Karma to the soil.