good flow is imperative.
also, fyi to watch out in terms of running carbon, if you look on the 'zoa' forum there's a relatively new issue of 'zoa pox/white bumps' that some say is related to use of carbon, especially 24/7. i was using carbon 24/7, had the issue (its generally temporary) and have since switched to carbon for 3-5 days a month and now issues since.
good luck with your new system.