I have to agree. Eveen short term can lead to disastrous results for these guys to remain in a bowl. As I see it, you have 2 options to follow. Either you take the fish back until you can get something bigger (45 gallons will be fine), or get yourself a large bin from any hardware store and put them there. The problem you are facing right now is that the fish are in a bowl which becomes almost immediately toxic to them due to the amount of water in the tank. Goldfish produce more bio-waste than other common fishes and is one of the reasons (just one) that they need such large tanks for. The are also extremely quick growers and produce double the amount of hormones in the water, thus the need for more massive water changes than other tanks. They also need double the filtration and need the water plentiful of O2. I know it seems that with how common they are around these days, in magazines, storefronts, you name it, that they'd be more easy to care for... when they are really not. They are most often misunderstood and misinterpreted in the hobby.