There'll be too many possibility on the sickness and cure. Also, it can variable with different environment of the tank. Example, always under sunlight and water temp difficult to lower to some desire point; therefore alternative solution need to be applied. Also, sometimes access to certain "medicine"might be a problem for a certain place in Malaysia.

The best is to identify the sickness and knowing the environment. Then only decide which option is the best. A good picture will tell the whole story.

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Japanese Ranchu is another ball game