Good monrning. I am looking for opinions on power heads. On a 36” long mixed reef tank. Is there a significant Benefit to running 2 small power heads, over one large one? The cost of 2 small units is much more than a single large one. They will be controllable, so they can be dialed up and down as needed. I doubt 1 small one will do it, but another option is to start with 1 small one and see how it does. Add another one later if and when needed.