I ran multiple light combos on my last tank that had a 4 bulb fixture.
My favorite was 3 blue + 1 coral +. To my eye coral plus and purple plus are very overpowering in a 4 bulb fixture and make a tank very white/pink so you need to balance with 3 blue plus. I ran 2 blue + 1 purple + 1 coral + for a while and it was very pink to my eye. I also ran 3 blue + 1 purple + and it was ok but still too pink for my taste. I tried an aquablue special and wow did that bulb wash everything out. I personally hate the flat white/yellow light this bulb puts out though so maybe I'm biased.
I now run 4 blue plus, 1 coral plus and 1 purple plus in a 6 bulb sunpower and I still think purple + bulbs are a little much! Thinking of going 2 coral plus next time i buy bulbs instead of the purple +.