I've been reading your articles regarding plenum systems in FAMA for several years now and set up my first reef system almost 10 years ago following your advise (and I have to say its been quite successful!).
I'm in the process of setting up a FOWLR system with a display tank of 125 gallons and a 55 gallon tank underneath as a remote plenum. I believe I read in a recent issue of FAMA where you stated that you now believed a larger sand grand size of 2- 5 mm would be better than the standard special grade reef sand (CaribSea). Would the CaribSea crushed coral be a good size then? If so, that would be nice since its about 1/3 less expensive as their special grade reef sand. I assume the same depth of 4 inches would apply.
Thanks in advance for any advice you might give me regarding this question and especially thanks for your contributions to the hobby!
Joe Glasgow - Birmingham, AL
Thanks for your email and the crushed coral is a perfect substrate for plenums systems. And yes, the depth stays at four inches.