upgrading my lighting on a 55 gallon tank with 40 gallon sump. My tank in 17 inches deep and I am not interested in keeping hard corals, perhaps a clam someday, and I keep my tanks in the garage so the heat from metal halides would be a problem without air conditioning, do you think a 8 tube T-5 light fixture at 432 watts would give me enough penetration? I have read a lot on the net on lighting and remain confused as ever on the subject. Any input from out there would be appreciated. Thanks.