One Last Question. . . I promise

[hockey nut]

Sounds like your lighting should be fine.

Atinics are more for colour and effect with some benificial trates but for clams you might want atinic eventually. Time will tell. It's a colour thing.

It is always trial and error when it comes to lighting and sps. Some sps will not mind the light you have and some will need more light. AGAIN TIME WILL TELL.
I can't see why you would not be ok with dual 150 wt HQI's in a 3 ft tank.

If I'm wrong someone will mention somthing soon enough I'm sure.

Happy reefing.