as long as they were acclimated properly i don't think you should have any problems with the 400W lights. how much flow do you have? how much and what types of coral do you have? any chance another coral is to close? are you running carbon? any other params you can list?
maybe post a pic of the corals, its a lot easier when we can see it.
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120S RR tank with 60G basement sump / fuge
Return Pump: Little Giant 4-MDQX SC
Water Movement: Seio 1500, (2) Hydor Koralia 4's
Lighting: 400W SE MH with 14K Aqua Connect
Skimmer: Euro-Reef RS250 with gate valve
Other: RODI, RDSB, PO4 / AC reactor
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