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Recently did this myself with the same pissed off sps. It is amazing that such a quick impatient decision can effect months of stability and effort. This is exactly what makes this hobby so frustrating yet so rewarding....
http://lm.facebook.com/l.php?u=http%3A%2F%2Freefhobbyist.tumblr.com%2Fpost%2F112209001293%2Fchanging-fans-on-chinese-blackbox-leds&h=kAQHXlkHy&s=1 this might help some
Your tank is cycled and doing its job, it now just needs to get better at it. Do a watery change, keep ghost feeding, and if nitrites are not that bad I would add your first small fish
So they were not driven to hard, 550 is safe with proper thermal contact to the heatsink. The blues in the old Chinese fixtures are known to burn up. Have no read about the issue recently so it seems they figured it out. How old are the fixtures?
Paul does the driver have a milliamp rating on it? These bridgelux blue leds are 700 ma max , not recommended above 500ma. These leds have a voltage of 3.5 so at 700 ma that is 2.4 watts each.