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With the light, you may have been superdosing your tank too much
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<font size="2" face="Verdana, Helvetica, sans-serif">Where he has gone from a 400W 10KK to a 250W 65KK I'd doubt he shocked his corals all that much. The PAR ratings are very similar for the two. If he was stressing his tank out they wouldn't show increased growth from the 10KK to the 65KK. If anything they would have decreased growth, possible bleaching and in the extreme RTN.
More likely there is something missing or differnet between his tank from the tanks he purchased the frags from.
FYI