Depends on the fixture. I had a 75g that was almost 22 inches tall and I used a 4 bulb fixture with great results. It had really good reflectors. I could grow sps everywhere. This being the LPS forum, I would say 4 bulbs if it has decent individual reflectors.
just go for 4 and i just put 4 coral plus and 2 blue plus in my buddies redsea and it looks great. and honestly you can use those coral plus bulbs as stand alone. no joke they are a nice 14k to 16k look but i would use 3 coral plus and 1 blue plus
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