Koi Stress in Small Tank: Water Quality and Space

6-inch koi in fish tank, regular water changes, not eating, pacing. Asks what causes stress.

Likely Causes

Test tap and tank water. Use filter. Upgrade to pond or massive tank. See author's koi site.

Pond and Water Gardening: Winterizing a Koi Pond in North Carolina; Koi Behavior in Cold Water: Surface Hovering; Black Water in a Koi Pond: Test pH and Nitrite First; New Koi Die After Pond Clean: Chlorine, Cycling, or Bad Luck?; Foam Around Pond Edges After Algaecide: Overdose or Surfactant?; New Pond Owner Loses Koi: Common Mistakes and How to Avoid Them; Koi with Large Body Holes: Disease, Toxins, or Cement Pond Issues?; Lethargic Koi in 1,500-gal Pond: Water Quality and Parasite Check; Three Large Koi Die Suddenly in 1000-Gal Pond: Oxygen or Toxin?; High Altitude Koi Pond: pH Obsession vs. Nutrient Control

Garden Articles

Plants