That is a ton of light in the tank! Have you considered the 1/10th inline chiller (I forgot the manufacturor's name). That may be right up your alley considering your future needs. I know it is a bit more pricey but it may be worth the extra protection.

Why don't you do a write up mod on the moonlight! I would be very interested in seeing it. If you wanted you could post it in my thread, lol .

Christopher