Im have only fed it one cap of Foxfarm big bloom and a cap of seaweed extract.. to a gallon of water I didnt feed throughout veg.. the PH of the feeding was really low and I didnt have any PH up to fix it.. it was around 5.5-5.8.
Id say its possible it could be overwatering.. but not anymore... and everyday i see leaves worse and worse.. and its not just one thing its several different things. new growth is coming out dead... leaves are yellowing with brown splotches and a few leaves are curling under..

Oh BTW I tested the ph of the soil and its about 6.2-6.6 or so..