05-23-2013, 04:55 AM
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Hello and welcome. Please take the koi back to the store, and do not buy anything else from that store. Koi can get upward of several feet long.I have a friend with a 3500 gal pond, and she won't put koi in it, it's too small! You can keep three to four fancy goldfish in a 55, but commons and comets need a much larger tank, preferably a pond. Please as suggested, read up on the nitrogen cycle of a tank. You will need to do water changes and get test kits to test the water, so you know how far along the cycle is, and when to change the water so the fish do not suffer.
If you want a community tank, perhaps look at some smaller fish, like neon tetras or other small tetras. Some bottom feeders such as corydoras perhaps, but any of these schooling fish need to be kept in large groups also to feel comfortable and school properly. I would suggest you slow down and have patience until you do some research. Nothing good ever happens fast with keeping an aquarium. Good luck!