Hi I winter my koi in two 6'x2' stock tanks they do very well with a pressure sand filter converted to kaldness rather than sand,also a Bio-reactor for the extra load of the fifty large koi that winter there. A good friend of mine opted for the stock tank,that which he dug into the ground an 8'x2' deep, it looks great with the skimmer with pump inside leading to a very nice little Bio-water fall. This tank holds his very nice large four koi. This is a very fast,easy and dependable not to mention affordable pond. With stone or brick around the perimeter will look very nice. Go for it ! All the best to youhas anyone made a pond out of one? you know the ones you can get a tractor supply to watre livestock? if so how hard was it and what all did you buy, what kinda fish do you have and how big is the stock tank?
Cichlid Kid said:I have a 140gal stock tank integrated into my main pond and it works great.