04-12-2008, 02:38 PM
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Personally, I'm using a bulb that is half 67k, half 10k, and it's the best IMHO. 18k doesn't support photosynthesis, so it won't really do much good in your FW tank. Did you buy an entirely new light fixture? If so, I would return it and get something higher wattage for the same cost- which you will be able to, I swear! I got my 40 watt for my 10 gallon w/ fan & lunar light for $75, which granted, is a bit more in AU, but with the exchange rate these days *grumble* but I digress...
Do you know the brand of this light? Is it power compact? Definitely go for power compact. I dunno if Coralife or Current USA is carried down under, but those are the two manufactures I use and LOVE. Also, I dunno if your light came with actinic, as it sounds like it's a SW light, but actinic is totally useless in FW, so no need to go for that!