re: Need tomato help! What's wrong with them?

Looks like blossom end rot. Lay off the water, and add calcium and copper.

Remember: stress in a plant encourages it to set fruit. So lots of water and fertilizer as the plant is growing. And you should consider pinching off the first flowers and fruit.

Then, when your plant is big enough to your liking, pull back on the water. It will think it's dying and it will make a big fruit set. Then just give it enough to keep it going. Fruit will be firmer and sweeter too.