What's the consensus on S. Haddoni and crushed coral? Completely skipped over that consideration when building new reefer 450. It's got about a 2" layer of Florida crushed coral.
I didn't use crushed coral in my system for a couple reasons, but I think it might be a little too abrasive for the animals column. I kept both Haddon's and PLTA's at different times, as a center piece, for a number of years, and would suggest that they need at least a 4" sand bed(I had 6" - 7" of sugar sized oolite).