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  1. is an airtight tank ok?

    Betta Fish Bowls, Habitats, and Accessories
    Hello, I was wondering if betta fish can live in tanks that do not have holes in the top for oxygen? I have a large tank but the lid does not have holes in it, and I read somewhere on here that the fish come up to the service to breathe.... so does this mean there needs to be oxygen inbetween...