This advice is intended for anyone installing a small (under 1000 gallons - about the size of 10-person hot tub or less) prefab garden pond or other little container pond on a patio or balcony. I've had several different types of ponds over the years, and, after a few learning curves, I've got a system I really like—easy to care for with healthy water, plants, and fish.
Fish pond The instructions said, "use a gal jar and a type of stand place the jar in the water on it's side, let it fill with water(completely submerged) then tip it up slowly bottom up, and place the jar mouth into the stand, making sure to keep the mouth under water. The fish can swim up into the jar as they wish.
22 Small Garden or Backyard Aquarium Ideas Will Blow Your Mind