What are the least expensive fish to take care of?

What are the least expensive fish to take care of?

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Probably Betas. They're on the real inexpensive scale anyway, and they're really easy to deal with. They don't require filtration, per se. They don't require any extra equipment. Basically, just water, a bowl to hold the water, food to feed the fish, and the fish. And that's pretty much it. There's still some maintenance involved, but it's minimal. It's going be your cheapest way to go.