I don't think your specific gravity is the culprit, personally. How do you measure it, though? I had a swing hydrometer that was off by .006 once (my SG was at 1.031 and everything still looked fine, imagine my surprise)
Has anything else changed in the system?
No offense intended sk8r, I just know that in the past all of my corals have been very forgiving of SG and I would like to know more!