Hey Stranger, how's your grow going?
I'm on my first grow and I'm having a similar problem, sprouted great then slowed right down, started getting brown spots and then complete leaves turned brown, the ph is normal, so I'm a bit stumped. Mines in soil and I take it outside in the day and supplement with a cfl on the night. Looking at other threads I don't think its cal mag or ph problems, I've flushed the soil as it was prefertilsed which sucks, I'm just waiting for the soil to dry out. As I live in Australia I think the soil may have got too hot?