Cycling every 1-2 hours is good. You definately will want to push water up through the bog, especially if your letting water fall off the top to make your waterfall. Otherwise, the water will simply run across the top and the bottom layers of the bog will go stagnant. Search addy1's threads on this site for bog design. She has some good advice. And, run your pump 24 hrs per day, 7 days per week. This is important to keep the beneficial bacteria and plants in your bog healthy. Thus, efficiency is premium. Laguna has some good pumps that are very efficient. Some people close their ponds down and turn pumps off when things freeze over in winter, but if you're in a warm climate (like me) that won't really be an option.