Many people who keep paradise fish know that they can adapt to poor water quality, and the aquarium does not need an air pump because the fish can poke their mouths out of the water and directly breathe air.
許多養鬥魚的人都知道，鬥魚能適應較惡劣的水質，水族箱不需裝幫浦打氧氣，因為牠們具有直接探出水面以嘴呼吸的本事。