I currently have a customsealife pc light fixture that I used for saltwater, but I switched to freshwater and need to change the bulb. what's the best bulb for me to use? I was thinking about either the 5000k amazon bulb from customsealife, or the 6700k bulb from the same company. Which one will work better? Thanks for any help. Oh yea it's a 30 inch fixture so it's a 22 inch 65 watt bulb. Any other bulb recommendations?