yellow

This is a new variety for me this year (Don Juan) I got the seed from J&L seed seed. It is so solid that I will have to buy more seed next year because I am not getting any. It has made a great tasting sauce.

My tomato seedlings are getting yellow. The seedlings are 3 weeks old and I am using jiffy pellets as the soil medium. These are the 2nd set of leaves and not the first set of sprouting leaves. I water at the bottom and I have a well for my water sources. My well water is about 7.5ph and my...