the old growth won't heal. they don't look bad
the top pic looks underwatered, this could be leading to your problem.
I have a feeding tray and i made sure there was run off so couldn't be
what kind of water are you using?
idk man, that first pic really looks thirsty. You can tell cause the stems aren't straight and firm, like the other plants.
such small pots........and not even filled up........*sigh*
your grow is not "fucked." relax. and one plant per pot.