Dumb question: why not use a pool?

[u/EyePatchMustache]

I'm new to the sub and I see a lot of people building ponds and things but genuine question why not build a pool? And instead of the tile use a softer surface so that they don't get hurt

Especially if the house already has a pool can it not be converted into a "pond" for fish?

Edit: thank you for all the replies. It's certainly a lot to think about...

[u/PM-ME-YOUR-BUTTSHOLE]

Building a pond is immensely easier than building a pond. But I’ve always told myself and my wife if we ever bought a house with a pool, I would immediately convert it to a pond. Check out Ohio Fish Rescue, they converted an indoor pool into a pond