Regular observation of your fish will allow problems to be detected early. Be familiar with your fish's normal shape, size and color as well as swimming habits.A change in these factors may signal a problem. The problem must be identified in order to know the steps to take for treatment.

Every pond owner with fish, at some time or another, will probably have to medicate their pond. Though Koi are extremely hardy, it is very important to keep a watch on their environment to keep them at their healthiest.

Attention should be paid to the quality of water and balance of the pond (i.e. pH levels etc.). However, if problems do occur, the first step is to remove the individual fish or decide whether to treat the entire pond.