I need help...

I've got 4 bagseeds in a 6"x6" on my windowsill. The biggest one is about 14" tall, the smallest 10", the other two somewhere in between. I keep the room at about 82 with fans going. The bottom leaves are beginning to yellow. I water them with about 8-10 oz of purified bottled water when the topsoil is crunchy and dry. Any suggestions?? I heard rain water but I dont know if I can get it straight out of the gutter on my house when it rains or let it collect somehow..?? They are about a month old. Will they survive even if the yellowing corrects, I mean the conditions (window sill)

what are you fertilizing them with. I think its a nitrogen deficiency.

I really don't trust window sills, either its indoors or outdoors, both need to be under direct light

I don't have a choice so it's the window sill. Can it work?

As long as it gets 5 hours of full sunlight.

I'm not fertilizing them...organic in a way. I read about urine but that's a little wild. I thought it was a N deficiency too.

with no nutes? just 5 hours and H2o?