Pond Size Check: 9×4 ft, Variable Depth, 13 Fish

Pond 9'L × 4'W, deep 4', mid 3', shallow 2'. 13 fish: 4 ghost koi, 5 goldfish, 2 shubunkins, 2 comets. Water clear, pH tested, 3 pumps. Asks if big/deep enough.

Volume Estimate: 700–900 Gallons

Conservative rule: 500 gal/adult koi. You have 4 ghost koi + others → ideally 2,000+ gal. Current: manageable but not ideal.

Real Test: Water Quality

• Rare ammonia spikes?
• Nitrates dissipate <60 ppm (plants help)?
• If yes → OK for now.
• If no → need water changes or fewer fish.

Plan for growth. Ghost koi get large. Monitor ammonia/nitrate weekly.