CF lighting is the bane of Zoa existance. You need to change the bulbs every 5 months (6 months max) or zoas will start to decline rapidly. I try to keep a new set on hand and when I see a few polyps closing or when a decline starts, I can quickly change out the bulbs. I would love to spend the money on a new lighting system, but my wife would rather have me sell off the tank. I have added an Ecoxotic LED strip and plan to buy a few more as money allows ($50 each) and slowly convert to LEDs.