Question.... are the stems on your plants purple also? Did it take them a while longer than expected to germinate?
My plants have this "browning" or what I see as purple coloring on stems and leaves. If yours are the same as mine (i'm using Happy Frog, with no smells or problems), try warming the soil up some. This year under my lights I just used some panda cloth and put it on the counter with black side up to absorb heat. My plants are still purple but they germinated much faster and seem happier. Once they go outside the purple coloring goes away rather quickly.
I also use clear solo cups because seeing the roots is fun, and helps me with not overwatering. I only water when the top inch or so is dry, I don't want wet soil on the top since it just seems to cause gnats and other things to wanna come in. However, you should put those solo cups into some red ones or something to block the light from the roots/soil or you will probably develop algae problems within a few weeks. I had heard this before and did a tester with a exposed clear cup this year and algae started growing after about 3 weeks.
My plants have this "browning" or what I see as purple coloring on stems and leaves. If yours are the same as mine (i'm using Happy Frog, with no smells or problems), try warming the soil up some. This year under my lights I just used some panda cloth and put it on the counter with black side up to absorb heat. My plants are still purple but they germinated much faster and seem happier. Once they go outside the purple coloring goes away rather quickly.
I also use clear solo cups because seeing the roots is fun, and helps me with not overwatering. I only water when the top inch or so is dry, I don't want wet soil on the top since it just seems to cause gnats and other things to wanna come in. However, you should put those solo cups into some red ones or something to block the light from the roots/soil or you will probably develop algae problems within a few weeks. I had heard this before and did a tester with a exposed clear cup this year and algae started growing after about 3 weeks.