All right...here's what I did.

I just finished breaking it down, cleaning everything and putting it back together with pure(no nutes), ph balanced (between 5.75 and 6) cool tap water. BTW, all three plants are now showing signs of the condition, though in the other two it's only just started.

When I took the top off I found a strange thing. The juice had a mild froth. I know that it shouldn't because the last time I opened it up to change out the juice for fresh there was no sign of anything like that. I don't know what the froth means, unless the juice was fermenting or something like that. Maybe one of you old hands would be able to tell me. I suspect that whatever was causing the froth is a very bad thing for the plants, and was probably aided in growth by light that was getting into the resivoir through the unused growing pots. Whatever it is has surely throughrouly saturated the rockwool cubes my babies are growing in, so I also rinsed the rockwool, rocks, and roots as best as I could. I'm hoping that the rockwool and rocks will completely flushed of the contaminant by the tubes that bring the water up to the plants. I also now have the unused pots covered so that as little light as possible can get in.

I'm going to leave them on plain, ph balanced water until friday, then I'll change the water out. I'm not sure yet if I'll add nutes at that point or not. I supose it will depend on A) how the plants look, and B) what the water looks like. If the water's gungy then I'll probably just clean everything again and go a few more days with plain water.

So...questions...
Have I done right?
Are my plans sound?
WTF was up with the froth?

Any advice at all is welcome. I'd be incredibley grateful for anything anyone's got to say about the situation.