I've had one I built myself about 12 years ago. Initially it was just to block the view of ugly pool motor & filter from my terrace but then I got into it. I doubt I've spent over $200. in all those years for everything. I overwinter a lot of plants, goldfish stay in year 'round, original Beckett filter/pump is still going strong. The biggest saving came from a friend who built a huge pond & had liner left over that I used. I added a small lotus bog next to it & a tiny, above-ground pond in a flower bed too. I love my ponds.
Technically I have three: small, smaller & smallest. Small is 2' deep & around 3' in circumference with a 2 foot waterfall & 2 goldfish. Smaller is 18" deep & 3' x 2' w/ gambusia. Smallest is 18" deep & 18" x 12" - also w/ gambusia.
:banana:Yes three one is 10 -7ft- 5ft depth 6-6ft - 4ft depth 6-6ft 3ft depth. all ponds have water falls one two and three are all linked Three pumps then the water can be pumped to the.top All this is going though five green to clean filters 24000 size with 25w uv lights.I have koi carp long fin butter fly and standard gold fish. All are different sizes they all seem to have there own characteristics and i have a smile at the Young butter fly
My husband and I built one last August and found that it is the only place we like to hang out. I got a hammock for Mothers Day and it is hung between the trees behind the top waterfall. The pond is ~ 1000 gallons and we bought a 20 x 15 liner and had to purchase more for the top waterfall and stream. It has water lilies, taro, hyacinth, pickerel rush, iris, hornwort, lotus will be coming soon. There are also three koi and 8 shubunkin goldfish. Here is the website. Roberts' Pond