Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to choose fish for a freshwater aquarium [title] Choose fish that will fit in your aquarium. [step] If you already have an aquarium, you can use its size to help inform your decision regarding which fish to purchase. Do a little online research-or talk to knowledgeable sales staff at a pet store-to see how large specific species of fish will grow to be.

Ending1: [substeps] Most of the breeds of freshwater fish that you find at a pet store will fit in a 15-gallon tank. Although juvenile fish you see in pet stores may be small, as they grow, many species will become quite large. Ending2: [substeps] Keeping your fish small and its size in mind can also help you plan out what tank to buy and getting your fish ready for buying. Treat your fish with the same care you do when purchasing fish from a store or natural food service. Ending3: [substeps] Remember that if you don't buy the right tank, you run the risk of having larger fish go extinct or staying out of water for a longer time. Perhaps fish that are worth purchasing will also grow the easiest and more cost-effective. Ending4: Then, consider buying more fish or switching to smaller species-fish that will thrive under only a few pounds of fish, though this does not guarantee a clean fish tank. [substeps] At the same time, try to be happy with each fish that you purchase.

Answer format: ending1/ending2/ending3/ending4