Originally Posted by db8
sorry, it's the 18w current usa satellite CF 12". so, HC would have problems... hmm...
So you effectively have 9W over 5G. Sorry, but your only going to be able to grow moss, ferns and other lowlight plants. I actually have the same light, but with the freshwater bulb over a 3.5g and I was able to grow HC using excel and a good substrate.