Setting up my first reef tank which will be a 75 gal with a Berlin sump. Length is 48 inches and my goal is a mixed tank with softies and lps. Maybe sps down the line sometime but I can't afford radions. I can't decide on what would be proper lighting. Would two 160 watt viparspectras do it or would I need three? Or would three AI primes be better? Or maybe two vipars with an AI prime in the middle? Help?