I saw this video on YouTube. The coral has a really nice swaying motion going back and forth. I did some research and found a few forums saying set your power heads to pulse mode. Right now I only have a single powerhead which does not have any ability to change the mode it just plugs into an outlet, in my 16-gallon bowfront reef. What do I need to buy in order to get that back-and-forth motion? I definitely need another powerhead and I'm guessing some sort of controller to plug the powerheads into?