Hey Growmie,
Advice on autos would be to watch your watering, autoflowers are less forgiving when it comes to major or sustained errors, which means you must water your autoflowering girls properly. 2. Cut the nutrients, autos only need 1/4 of what photos use for nutrients. And last 3. Don’t top, or pinch your autoflowers like you might do when growing conventional cannabis. With autoflowers, the only training method you should use is low-stress training. And to answer the 2nd part of your question Yes you can keep the autoflowers in the same tent while the others are on a 12/12 light schedule, I've done it several times.