Its about 200 gallons but we are adding a stream to it and another small pond to it. The pond store that I go to has them in smaller ponds than mine. I know they get large the pond store sells them in the larger sizes also. I just have 4. One is a tiny baby. The pond store gave him to me for free for Mothers day. Then I bought 3 more that are small to medium size. They are small in my pond though |