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With a betta, you can quarantine in an ice tea pitcher on the counter if you need to. As labyrinth fish, they can be kept temporarily in a pretty small container if you are treating them. It's putting them in little cups permanently that's a problem.
I keep a little plastic 1g container as a backup qt for smaller fish (though I also have a 2.5g for medium fish, and I have air-driven filters for both).
One of those cheap plastic betta tanks stored in a cupboard as a quarantine for your new fish wouldn't take much room. Rather than keep one set up and cycled, half-fill it with tank, half new water when you need to put fish in. Keep a mini-sponge filter and air pump rolled up inside white storing the tank, but leave the sponge part in your regular tank filter, and you have a cycled sponge ready for quick setup.
I keep a little plastic 1g container as a backup qt for smaller fish (though I also have a 2.5g for medium fish, and I have air-driven filters for both).
One of those cheap plastic betta tanks stored in a cupboard as a quarantine for your new fish wouldn't take much room. Rather than keep one set up and cycled, half-fill it with tank, half new water when you need to put fish in. Keep a mini-sponge filter and air pump rolled up inside white storing the tank, but leave the sponge part in your regular tank filter, and you have a cycled sponge ready for quick setup.