Is anyone still trying to get things started?
Anyway, a suggestion for anyone still trying it.
Forget lettuce and the like and try some of the local water plants.
Here in the Philippines I stick 4 or 5 sticks of cancoon in a jar full of water and give it low light,
It has 1"~2" roots in 24 hours.
Within a week it's doubled in volume.
Who knows what would happen in a fish thing like Paul was working on.
Like I said, it's just a suggestion.