re: lights, Marc
Its hard to say... pending tank size and species kept under it (and their needs).
To generalize though, if the tank is 200-300 galls, the total lighting is in the ballpark for a typical garden reef display.
As for the 400's being too much: I'd say not at all for tanks 30"+ and particularly if you are using 20k K lamps over deepwater species (LPS Euphylliids, Fungiids, and/or Corallimorphs for example)... or... 6500 K 400's over a dedicated shallow water sps tank.
no worries
