It have 4 different options as far as wave intensity goes... From light (fish only) to more intense (reef). It has an automatic nightime setting that the intensity will calm down for 8 hours at bedtime. It also has another option (which I haven't used yet). My hubby read about it and he explained that it has 3 settings. A nighttime gentler setting (8 hours) a morning with a little more agitation (also 8 hours) and an evening with the most power.(again...8 hours). But once you hit the night-time button, it will remember the setting and automatically change at the same time every night. And it has a feeding mode, you simply hit the button and all of the PH's slow down significantly for 10 minutes.