A bit late on this grow but good job on your first harvest!! Id advise you to find your hotspots in your grow box prior to continuing on with future grows. Looking at your leaves they look heat stressed. Even though your temps are at a good range those lights and a small space can create a bunch of hotspots causing your leaves to look like that. I had that happen on my first grow.
Secondly, everyones right about covering that clear plastic. Algae can start to form and kill your roots. Yet another issue i experienced in my first grow, but quickly solved by covering up and watering with a hydrogen peroxide solution.