I don't think you would need one. With an RKE you get 4 standbys and you can set them up for different situations that you might use a switch for. Example would be if you didn't want the return pump on for feeding. You can set up a standby for 30mins and just hit that standby for feed mode. Same with cleaning...have a standby set up to shut down your skimmer and pump for an hour. I see no need for a DJ switch system.
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Dave
My 130g tank: http://www.reefcentral.com/forums/showthread.php?t=2387989
Current Tank Info: 130g build in progress
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