I think you need to let them dry out a bit, just stop watering for several days and if possible get them outdoors for some natural light in a sheltered place. Both of those strategies can help with fungus gnats as well, if that is the root of the problem. You might want to pick up some mosquito dunks or gnatrol for the next time you water. I like to touch the soil surface with my finger to see whether it's dry or not. Many times it looks dry but when I touch it I find the damp is still there just a little below the surface...
What kind of LED's are you using? A number of people (including me!) have had trouble with the single spectrum shoplight LED's this season, which doesn't seem to meet tomatoes' light requirements. Natural light is the cure for that too...
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