Nutrient Lock-out???!

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Detailed information on nutrient Lock-out, please???!!! How do you know if you may have nutrient lock-out? This is why you're supposed to read directions (haha). When I started with the three-part Flora series; thought I was just supposed to add Floragro until the plants were ready to bloom before I start adding florabloom and them didn't know what floramicro was for. Within a few days after looking at back of bottle, realized I was to add all three at same time. Of course, did it backwards. Added micro last. Replaced nutrients last Sunday for first time, and added micro last again. Got two setups: Fish tank without fish (growing lettuce & some broccoli). Plants look great w/ a little stretching. This is third week and they're at 3". 2nd setup is in a tupperware with misters to 6 plants (4 corn, 1 tom., 1 cucum). 1 corn seed is 4", 2 others are sprouts and the rest, don't think they like the water. Anyway, my question is: Once locked-out, always locked-out?!! Do I have to start over with new seeds? Can I replace nutrients and see if that works. What are some of the signs of lock-out. Any information will be greatly appreciated.