Since December or so, I've been having my same old problems. Coral began slowly dying. Last time, I struggled for a year before finally replacing my skimmer and adding ozone. That solved my problems at the time, but I was never sure if it was the skimmer or the ozone.
I've lost all my gorgonians and the rest of the coral is slowly declining. Here's a couple of photos showing how unhealthy some look at the moment:
A few weeks back, I confirmed that my ozone generator was fried. I just installed this replacement unit... an Ultralife UZ360. This kind of generator doesn't require an air dryer and should be more reliable than my old unit.
If this doesn't work, I don't know what I'll do. I don't see the point in paying for all that electricity if the coral is just going to die in the long term. FOWLR here I come!!
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436