Twitchy Copperbanded Butterflyflish

[fishfan]

Hello, I have a Copperbanded Butterflyfish and it seems healthy other than a bit of a twitch when he is swimming upwards. He doesn't show any signs of illness and eats regularily both spinach and mysid shrimp in the flow-stream and grazes normally on the live rock. I know that butterfly fish are expressively twitchy to each other but he only seems to twitch when he is swimming up. Anyone have any ideas on this?

[Reefing Madness]

I don't really understand "twitchy". I've had a Copper Band for over a year, I've never seen him, twitchy, I think. If its when he's swimming up, take a look at all his fins and make sure they are all there, and doesn't have one torn up.