ive heard of certain animals not being able to see red light like most fish and reptiles but does anyone know if octopus can see this. if they cant im thinking of getting a red moon light on my tank. n e ideas?

I think the general consensus is that they can't. Blue, however, is quite visible to them. IMHO, HTH.

Felix

Felix is right, they can't see red. That's why red moonlights are recommended for nocturnal octos - or any octo, for that matter.

Nancy

Or nightvision perhaps?