how much atinic?

[Bob I]

Originally Posted by asmodeus

I thought that you need actinic on the tank for the corals to grow

I realise this is an old discussion, but sunlight in tropics is 6400K at noon. Does it not make sense that if you supply full spectrum lighting things will grow However, I agree that higher K lighting looks a lot better to our eyes, but I don't think corals worry about that. In other words what looks better to us is better. After all we have to look at our tanks, corals can't see anything.