Beginner Gardening: What is wrong with this plant? 1st time gardener, 1 by TheBradshawBunch

TheBradshawBunch wrote:
This is a La Rosa Roma tomato that is about 4 wks along. On several of my tomato plants I have noticed a whitish hue developing on some of the leaves. These plants are grown under full spectrum lighting placed 2 inches above the height of the plants. They are watered through capillary mats. The only thing I have sprayed on the plants themselves is a diluted hydrogen peroxide solution to stave off fungal infections. I have started to feed the plants a very diluted miracle grow solution and will alternate feedings with a worm casting dilution. I can't figure if this is typical of the plant or if there is something wrong with them. It does not appear to be fungal or powdery mildew because it does not rub off.
I have also noticed on several flower plants a lightening around the edges of the leaves which seem to curl somewhat. Are they being burned by the fertilizer?
Anyone have any clues?