I am fairly certain Reef Keeper has a new Tunze control module, I would look into that. The 6105's are the way to go, I would get 2. If the tank was mainly LPS and softies a pair of 6095's could also work, but the flow from each pump will only reach about the middle of the tank, 6105 can span the whole length which is preferrable for keeping detirtus stirred up.