I planted some tomato plants on 3/5/2013.

Seed Type: Super Sweet 100 Hybrid Tomatoes

Water PH: between 5.8 and 6.5

Light Source: 2 - T8 Skylight bulbs

Room Temp: Day 70F Night: 60F

Fan: Open windows provides plenty of air in the room. No fan blowing directly on area

Medium: Coconut coir disks

Setup: 5 gallon gray container

Water Source: tap but phâÂÂed down to get the right ph for garden

Nutrients: davidâÂÂs grow (grow, base) with MagCal and Fulvic acid added midway through the cycle timeframe (as I was worried about nutrient loss)

Airstone: one giant one

Problems:

As seen in the photos, the leaves are quite yellow with no real reason as to why. Initially when I saw the leaves yellowing I cut off the most yellowed leaves, replaced the nutrient solution and added the fulvic acid and magcal. I also got a light (grolux) that I thought was great for the plants. Today I replaced the grolux with bright t8 skylight bulbs (the closest to sunlight I could find). The stems are purple. Since this is my first time I think maybe it was that I placed too many tomato plants close together (3 essentially very close in one net pot) but with the yellowing it could be some virus also. Any suggestions on where I can grow from here would be great. Thanks.