We finally have a tomato we can eat.
We threw away the first several before they ripened because they looked diseased.
I started feeding them fish emulsion, every other week, in early August, I think. After that, someone said they looked like they needed calcium, so I dissolved some epsom salts in water and sprinkled those around the base of the tomato plant. I don't know if one or both of these is the reason for success, but I will definitely be testing the soil next year, and feeding the tomatoes.
I also have high hopes for these guys, waiting in the wings.