Koi-Care staff says:
August 31, 2014 at 1:30 am
You need to quarantine your fish, first off. Then increase the salt concentration to 0.5%. You will want to treat the water with mela-fix. Make sure your quarantine has good aeration and filtration. Your pond water probably has an increase in excess nutrients that allow bacteria, like the one most likely causing the red spots, to thrive. You will want to test your pond water on a regular basis and watch for ammonia, nitrites, nitrates. You can even do something like microbe-lift to boost your beneficial bacteria load in your filter media.
Good luck, Grant
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How To Care For Koi | Pond & Fish Care | Koi Tank | Aquaponics
We moved into a home with a koi pond, but had no fish. We got 3 small koi and have had them for 3 months now, they loved to eat ( they are growing fast ), swim around and they have never been social with us. They seem scared. Anyhow about 3 weeks ago they started hiding under the waterfall, never come out anymore during the day. They do swim around at night. They also don’t eat much. The temp has changed. It was a very hot summer and now its much cooler especially at night? Git any suggestions. They don’t look diseased.
I've listed 5 tips on taking care of KOI fish for you
Also known as Cyprinus Carpio, these decorative varieties of Common Carp are known as symbols of love and friendship. These native Japanese fish are available in many colors and color combinations including white, black, red, yellow, blue, cream and silver. Koi are somewhat larger than Goldfish and to take care of them, you need to be just as cautious as you are when caring for Goldfish.The first step in caring for your Water Koi includes proper cleaning of your pond. Water quality is the single biggest factor in Koi health. In order to know how to properly care for your fish you need to be knowledgeable about Koi pond maintenance.