What are you using as your return? How much head loss are you experiencing? Does your display have drilled returns? The reason I ask is you may be able to meet your circulation needs by cleaning, replumbing, or upgrading your return pump. An efficient return pump would increase flow, use less electricity, and reduce eye sores in your display. Well placed returns can create a surge effect you are looking for. Do you want allot of flow in one direction, or allot of flow all over? Just a thought.