Running a studio can be a major juggling act. You have to stay on top of the big things, like paying rent on time and chasing after delinquent payments, and track the details, like replacing that blinking lightbulb and sending out a snowstorm alert. No surprise, then, that a few things slip through the cracks—costing you money or students. Here, some savvy studio owners talk about five common but often unnoticed mistakes, and what to do about them. Pay attention to these, and you'll find yourself with more time, clients and revenue on your hands.