this might help with a light recommendation...
Look at the specs of the RSM 250 (66 gallon)
Dimensions (LxWxH) 960 x 552 x 665 mm (38 x 21 x 26.2”)
Lighting 6 x 39W T5 Linear
Red Sea MAX 250 | Specification
Q: Are the lighting and circulation in the MAX suitable for all kinds of invertebrates?
A:
In long-term tests we conducted on the MAX 130 & 130Din our laboratory, the system proved capable of supporting all soft corals (Sarcophyton sp., Lobophytum sp., Sinularia sp., Xenia; Cladiella sp., etc.), all LPSs (Large Polyp Scleractinia, like Euphyllia sp., Plerogyra sp., Nemenzophyllia sp., Trachphyllia sp., Caulestra sp., etc.), some SPSs (Small Polyp Scleractinia, such as Stylophora sp. and Seriatopora), sea anemones, all types of crustacean (cleaner shrimps, peppermint shrimps, hermit crabs, scarlet hermit crabs), sea stars and giant clams (Tridacna sp.).
The Max 250 has been designed specifically to be capable of supporting even the most delicate SPS corals, and offers no limitations other than the physical size of the aquarium.