Hydroponic Tomatoes have yellowing leaves
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 phÃ¢ÂÂed down to get the right ph for garden
Nutrients: davidÃ¢ÂÂs 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
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.