Originally Posted by puffer32
Yeah, I am suprised by vipers answer. I have over 6 watts per gallon, usually thats enough for just about anything
A common misconception. Watts per gallon isn't at all an accurate way to measure light, especially as the tank size gets smaller. For example, I can fit a 9 watt PC bulb over a 1 gallon tank, which would make 9 wpg. However, that 9 watts of PC light still is barely enough light, just enough for some soft corals. When it comes to light, the volume of the coral's surrounding water makes no difference. It's all about the light itself and the position of the coral in relation to the light source.
HTH