THese “breathing bags” are perhaps good for fish that use much oxgen even in transport situations (swimming etc.), but they are not of any advantage for licorice gouramies. Our fish rest motionsless below a leaf and wait for their fate. In case of distress they use their labyrinth, even if they don_t use it in normal situations.
It’s a commercial hype, just as many other offers of the aquarium industry. Forget it for Paros.