Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to care for corydoras [title] Get a good-sized tank. [step] Corydoras are not very large fish, and generally don't need too much room. A 20-gallon tank should be plenty big enough for a small school of non-dwarf corydoras (6 fish).

Ending1: To ensure the corydoras get enough oxygen and energy, buy a large tank of three or four. You'll want enough room for 2-6 young corydoras for every 8 adult adult sized corydoras you have. Ending2: [substeps] To find a good sized tank, consult your local pet store to find the right size of tank for your corydoras. Size your tank to suit the amount of corydoras. Ending3: Of course, if you consider adding more fish, whether corydoras or something else, you'll need a bigger tank. [substeps] There is a traditional " rule of thumb " that suggests 1-gallon per inch of fish that you put in the tank. Ending4: Large corydoras can sometimes get cramped and old. A 10 " tank will be your best bet.

Answer format: ending1/ending2/ending3/ending4