All living things display their most glorious hues and forms only when they live in a comfortable and suitable environment. However, if since a fish is not good, you won't get good result no matter how much effort you put into caring for it therefore selecting a healthy and good fish is fundamental skill in this hobby.
Below are a few tips i would like to share:
HEAD
The most important and attractive part of this fish. A fine specimen of luohan will have a large and protruding head. A fish's face and mouth also should not too long and look resemblance of 'monkey face'. When small you should select a fish that get a hump. Therefore, genetics also play major role in deciding possibility of big head.
Above image is an example of a hump in small fish. The fish only about 2 inch long.
This is another example of my fish. the fish also about 2 inch long.
This is full adult size fish. The fish have big protruding head with good body shape & swimming posture.
SWIMMING POSTURE & BODY
A high grade Luohan should have a sturdy and muscular build. The fish should have a height to length ratio of 1:1 or 1:1.5 and squarish body is considered most attractive. Seen from above, the right and left sides of fish body should be balanced and symmetrical. Therefore, a fish with a firm and full body flesh should be chosen as high grade fish. The fish should project a sense of self confidence and vitality when swimming. The Luohan body should show spectacular colors with bright hues. Usually, the dominant color will be red and very bright red will put the fish as very high grade. The fish also need to have very broad and slender fins. The angle of fan-shaped extension above and below the tail fin should be as large as possible, and may be as great as 180'. the dorsal and anal fins should also be large and slender. The dorsal and anal fins should completely surround the tail fin, so that all 3 fins form a lovely gauze kerchief giving the fish an air of refined grace.
This is an example of high grade Luohan.
That all for now....will write later to how you taking care this fish?