So I am getting a new 90 gallon cause I am down sizing from a 240. So what I want to know is how many more reef brite xho fixtures I may need for a sps tank. I have 2 x 48" all blue xhos. So the tank is 48 x 18w x 24h. So since I have 2 all blues how many and what colors should I get so the sps will thrive? Thanks for the help.