Not really, just like normal..fast if i approach him..but i would consider it normal.It's hard to tell from the picture, but is his breathing a little rapid?
Normally?he feeds during dawn and dusk, as usual..doesnt swim with the rest, but same goes to the another very healthy 8 inch clown..i saw him doing the loachy dance alone though...it was 5 am and i peeked through the window.Unfortunately, i couldnt see his poop...there are 4 more large clowns and it would be very difficult to differentiate..Is he behaving normally otherwise or is he settled in one place twitching like this alot of the time? Eating, browsing the substrate, swimming around with the others? Is his stool (feces/poop) normal?

Exactly, as for now, it is night time here...and he is not vibrating at all.Just sleeping.It almost looks involuntary, like a spasm...but I'd think if it were neurological it wouldn't stop when sleeping?
Not really at the corner, at the output of the sump return pump, but there is a female clown, at 8 inches long..the very plump one. He do possess alot of tubercules as I've posted before.In some fish a twitching movement similar to this is used as a courtship ritual. Male angelfish twitch their dorsal and tail fins to catch the attention of a female, some cichlids do the same. However, this doesn't seem to be the same thing. He seems to be sitting alone in the corner, no females in sight?
It is uncooked..will cooking destroy some of it's nutrition? i've just given him both parasite and antibiotics recently with parasite treatment a week ago and the antibiotics 2 days ago. He doesnt swim aimless, knows the aquarium well and doesnt swim into the glass unless startled.Do you feed the market prawns cooked or uncooked? Uncooked fresh meat could be carrying parasite eggs...also an internal flavo bacteria infection can be indicated by aimless swimming or spasms.
I spend hours per day observing my clowns..jobless...waiting for my examination results.really hard to say. It's good that you're so observant. All to often subtle signs of stress that are early indicators of problems go unnoticed, allowing a disease to progress to the rampant stage where it is difficult if not too late to treat. The hard part is figuring out what those early symptoms are indicative of...

Thanks! I really appreciate everyone's effort in replying in this thread.
