Hi,

Newbie to this board and to hydroponics. My father ahs done this with a lot of success.

I built an 11 plant system (the HydroRon's system on HydroponicsOnline). I like the layout and that it is small and relatively inexpensive to build. I have planted 7 tomato plant, 2 peppers, a zucchini and cuke plant in the 11 pots. The system works great, as far as filling up, etc. I am feeding the plants 6 times a day for 10 mins each cycle.

Here is my question(s): the leaves are turning yellowish, and in some instances blackish. Too much nutrient or not enough? How do I check nutrient levels (too much/not enough?)? Am I feeding too much/too long? The nutrient I started with was a 'SuperTea' concoction for starting plants out and getting them established. I used 12 gallons (more or less) of water and the appropriate amount of liquid nutrient to it (I believe). I also washed away all of the dirt from the plants before I put them in the pea gravel (didn't think that there should be dirt in the water).

Anyway, any advice would be most welcome.