This guy in one of the tanks at KLCC Aquarium, Kuala Lumpur.

Everything looked South American to me. I had no pen & paper that day, so I didn't bother reading the tags. I had my brain replaced with a sieve, some years ago...

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Not south american, but southeast asia as the fish is Labeo chrysophekadion (Morulius chrysophekadion) or black shark and can reach a size of 2 foot, but is a very nice looking fish that has a green sheen to it under the right lighting

Thanks, Clunk !

Which section should I move it to ? Some of these fish are beyond the scope of my books (and I've more to come !).

Is it a relative of the little Red-tail Black Shark ? There seem some similarities. I enjoy watching my Red-tail sniff about for food, sort of a cross between the behaviour of a Cory, and a regular fish.

It is similar to a red tail black shark, but i would not recomend it for a "normal" community tank, due to its size and can be aggresive.
Both fish are from the Cyprinid family, so that is where it needs placing

I see you've 'Moderated' it in there yourself. Good stuff.

My Red-tail is much more out-going these days. Doesn't zip into jungle whenever I walk up. Good pic potential now.

Here's a pic of a 'Red Tail' ! (I wondered where that spoon had got to...)

Nice pic of the tail you just need to catch the body now