There was a thread on RC awhile ago i saw with a guy with a 1500 system who had 3 external skimmers, 2 rated to take the whole tank. Redundancy is a GREAT idea, so that if you have to take one out for a bit you can still survive. He would clean out each one a month apart so that the break-in didn't really affect the tank much. I'll try to find the link, it was a very well done build. He had 4 return pumps each with a flow sensor that would automatically take one out if the flow dropped below a certain amount and start up another. Can't wait to see more details on the build, good luck with the system.
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