I think 4 is good alone for softies and lps....add a couple of your favorite strips like reefbrite or orphek and that adds a whole new dimension.My tank is 8' x 4' x 20". Would 4 be good, not enough, or overkill?
We have 2 right now over our 4' x 8' lagoon with 2 reefbrite 72" strips and until we add sps it will be more than enough for softies, meats and all of our torches.

