How can I use an old hot tub for a water garden?
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Yes! I did exactly that 6 years ago and it is still going great with papyrus, hyacinth, and guppies (fish control mosquitoes). Make sure you put it on a level place where you want it. Once you have things growing it will be very difficult to relocate the fish and plants.
With the plants and fish the pond has stabilized and doesn’t need any care. The fish live off of the algae and all I do is take out old leaves and plants.
Depending on where you live you may need to plan a low voltage system for a heater or a recirculating pump so it doesn’t freeze and kill the fish.
I have found Lilypons to be an excellent source of equipment and advice. They also have a learning center which answers many questions.
https://www.lilypons.com/category/76
If weather permits, grow lotus in it
This may help you out: https://www.youtube.com/watch?v=-opRBBVOfkc
If you add a water pump in it that work? Then you could just add a bunch of plants around the outside to hide the sides.