Hi, I have a small pond with a few gold fish and one bigger Koi in Cambridge, and I have a problem with the koi.
The problem: Roughly two weeks ago, I noticed that my Koi lays occasionally on his side on the ground and does not eat much anymore. Since the water seems fine (ammonia , 02, nitrite, pH all very good), I have given the koi salt baths in a separate tank (10g pond salt per litre, 10 minutes) and I have treated the pond against parasites (with NTLabs, Anti-parasite &fungus, one full 5 day treatment). For a short time, he seemed better, but today he was laying on a side again. When he swims, he seems ok and has certainly still a lot of power, but he doesn't seem to eat a lot.