Hi,

We have inherited about 12 fishes from the previous owner of our current house. They are Kois. Of late, about 1.5 months back, we notice that they are not swimming as actively as before during the day; they just crowd around at the bottom and corner of the pond. But when night falls - they started to swim around the pond - seem to be as active as they usually were. We have engaged specialist to perform PH test on the water and were told that the water is fine. A week back, 1 of the larger Koi died; when removing the fish from our pond, we don't see any anomaly or decolorization on the skin.

Can't seem to figure out what went wrong... any suggestion?

thanks!