First of all, fish pond project requires lots of water in a big container. To supply it continuously with clean water would be expensive as the use of clean water would increase the water bill. To not use clean water however, would also cost more as lots of fish would die and organisms that rely on the supply would too. Now you'll have to buy new fish and you're stuck with dirty, unlivable fish water.
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Answer:
uh what.
First of all, fish pond project requires lots of water in a big container. To supply it continuously with clean water would be expensive as the use of clean water would increase the water bill. To not use clean water however, would also cost more as lots of fish would die and organisms that rely on the supply would too. Now you'll have to buy new fish and you're stuck with dirty, unlivable fish water.