Ive been told by a couple of people who have had bowfronted tanks that they have suffered bad headaches and felt a bit after watching their fish for long periods. They thought it was due to the bow acting as some sort of lens. Has anyone else heard this or are my mates just drinking to much.

something else ive noticed with this fish, he has the ability to change colour depending on the surface hes on (very cool) is this a trait all bristlenose have or is it particular to a certain species?

Do all bristlenose have those weird spiney clusters they keep hidden?

I have just rescued this fish from a friend who moved, Im pretty sure its some sort of bristle nose but not sure, it has small stubby bristles round the mouth and when aggrevated small clusters of spines appear just behind the mouth. I will try to get a picture anyone any ideas??