The Nero submersible pump comes with 4 different modes to choose from! These modes are Constant, Random, Pulse & Feed Modes. When programming your Nero pump, you can set multiple modes with a maximum of 30 different points throughout your 24-hour schedule.
Constant mode: allows a set continuous rate of flow.
Random mode: simulates a low or high energy reef, you can manually adjust your Nero's speed percentage to have it run at a lower or higher flow.
Pulse mode: will create a resonant standing wave, this allows you to mimic the waves in a natural reef environment
Feed mode: allows your Nero to slow down to its minimum speed of 1%, this allows you to easier spot feed your corals & allow your fish to easily access food suspended in your aquarium.
For more information on how to program your Nero pumps and the explanation of their modes, please see the following instructional video link. Nero Programming & Modes Explained