1200 gal section of one of my ponds and currently 500 gal in my basement temporarily for the winter... next summer i plan to build a 1000+ gal indoor pond in my basement. there are 11 4"-8" goldfish in the pond and about 200 fry... plus i have another pond with 50 4"-8" goldfish and too damn many fry to guess at... plenty to eat and alot of room to move