Which reactor: BRS or TLF?
The brs ones are quality. I have one sitting here at the house unused if you want to check it out in person or I'm sure one of the local shops might have one in stock. I k ow I've seen brs stuff at Elegant.
As for running a dual or two singles. I would go two singles. With dual you don't have room to play with the flow like you said. You can probably run them off one pump with valves going to each reactor.
Just my opinion though and as a disclaimer, I don't even have a reactor set up on my tank right now.
John
"Critics are men who watch a battle from a high place and then come down and shoot the survivors." Ernest Hemingway