Color Changes in Koi, and Other Species of Fish

Koi and goldfish color changes are USUALLY genetic but sometimes you’ll see a koi or goldfish turning black. USUALLY this is from a crashed pH, chronic parasitism, or ammonia-burn. The following test kit, tests for EVERYTHING. It’s 16 bucks and takes 30 seconds to run. Sometimes the blackening is INTENTIONAL by breeders in Asia who […]