Octo Pulse 4 powerheads

[KJAhp098]

I currently have 2 octo pulse 4's with controllers and I'd like to add 2 more. Do I need to order them with the controller or is there a way I can connect a powerhead to the existing controller?

 

[Scoob]

I was thinking about getting the octo 4, what size tank do you have ?

 

[Awesome Dennis]

The RO controller only does 1 pump.
I have a 180gal with an pulse 4 and I turn it down otherwise it moves the sand.