first waxy then rust

I have one plant that through out its whole life has been having problems. I don't know if it is a genetic problem or what. I'm growing hydro so my guess is that if it was a problem with the water the rest of my plants would be showing similar signs. All my seeds were various seeds (this is my fist grow). This one plant's top new leaves first emerge they look just fine. then as new growth comes in they get a waxy look to the leaves then the ends begining with the middle finger curls down and looks wavy like it started growing uncontrolably. As the leave gets older and lower it starts showing rust spots and the leaf basically starts falling apart. The plant is about a month and a half in ~ 1' high. Should I just kill it and quit worrying about it or do I have some kind of real problem?