

There one month old today. Smaller one is an auto Osiris and the other is a super skunk auto. How do they look?, this is my first indoor grow so cut me some slack

So my questions are :
Do you have to use nutes? all i've used so far is water from my buddys fish tank, which they seem to like.. only thing i can find is MG tomato food which I'd like to avoid. Don't have any local supply for anything specialty and if I order offline they'd be harvested by the time i got it. lol
Temperature? I've been around 75-80 good?
Is it normal to have leaves die like the bottom ones?