My tank is 99% reef ceramics. I was having a nitrate issue but recently brought it down to 4-6ppm by adding some LR to the sump and a sulfer dentirator. I'm not sure if the RC are to blame for my nitrates or my overfeeding the crap out of the tank which i tend to do. All the parameters are in check at the moment. When Skippy reef pm'ed me about the problems my nitrates were at 50ppm and I was thinking I was having the same problem. the difference is My corals are growing like crazy. I had a 125 setup before this with 100%LR and with my new setup I would say my corals are growing faster and much more colorful. granted I have different lights and filtration on my new setup.
I waited it out a little to see if I could get the nitrates down which they did come down. I don't have any of the same symptoms as Skippyreef is having with loss of coral and fish. the only two fish I have lost have been 2 Dispars out of 16 which is sort of expected. My Moorish Idol, crosshatches, CBBF 5 tangs, etc... are all doing great and seem to be very happy. The colors of my corals just seem to get better and better and polyp extension is not a problem either.
At this point I'm definitely paranoid about Skippyreef's misfortune and some of the others that have had simular situations. I'm not sure if I got a different batch, although It seems like Scott has had the same stock in his wharehouse for a long time, so I would assume it's the same stuff. Maybe my way oversized skimmer is helping, I'm not sure. Very strange.
Also my diatom bloom went away in the first 3 months and hasn't come back, I did go thru a little cyano which lasted about a month but with the addition of powerheads making my 380g. tank over 25,000GPH flow it helped.
I definitly feel for you skippy and the investment that you made in going with reef ceramics. I hope my tank doesn't end up in the same situation.
Just want to make it clear I'm not backing up reef ceramics at all. If I'm 1 guy out of 5 that has had success (at the moment) That is not very good odds to go on. When my nitrates were high i was very close to pulling them all out but because that was my only problem unlike skippy, so I decided to stick it out.
Click on my little red house and it has some detailed information about my setup and some poor picures of my corals and fish. Still trying to learn how to use my camera
Here is a shot of my tank last month when my nitrates were at ~50
<img src="http://www.shallowreef.com/display_image.php?id=252">