More than sushi - KOI Sushi

koi5000Oase BioSmart 5000 Pond Filter (56929) The Oase BioSmart 5000 Pond Filter is desned to eliminate cloudy, dirty pond water and algae growth by converting ammonia, produced by3. How Many Koi Can a Pond Hold? Overcrowding a koi pond leads to poor water quality, stunted growth, and stress-related diseases.. General rule: 1 koi per 250 gallons