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Have a proper set up ready before bringing home your new pet. This prevents possible mishaps. Lots of people skip this step, but it might be a good idea, if you find a fish, to ask a store employee to put it in the back or tuck it out of sight so you can come back for it a few days later.  It's also advisable to cycle your tank at least a month beforehand, especially if you have live plants in your tank.  Don't place a male betta fish with another male, and don't place a female with a female. Contrary to popular belief, placing girls together, called sororities, are not at all safe and in fact very dangerous and stressful for the fish involved. If you want two bettas, don't put them together under any circumstances. They have been selectively bred to have an instinct to fight another individual of their species to death, hence getting the name Siamese fighting fish.  Female betta fish will fight males and vice versa. Don't put them in together. Read up on breeding them if you think you want to try it, but remember that breeding bettas is a huge commitment, and not something to be taken lightly. In the wild, bettas inhabit Thai rice paddies. Hence, they are suited to living in relatively shallow, but very large environments. To meet the spacious need, consider giving your betta a decently sized tank. This will help prolong its life. Pick a tank of 5 gallons (19 liters) or more for your betta to thrive. It may seem like a lot, but it's what your fish deserves. Various equipment is required for the successful keeping of Betta fish:  Purchase a heater with a thermostat––Betta fish like water temperatures between 78-82ºF/24-27ºC. Bettas need a heater in all cases (they are tropical fish) ––for example, if you live in a cold country or if you have an aquarium below room temperature, then a heater is required. During the winter, you may want to add another heater or place your aquarium close to a radiator (1 meter/3.2 feet away), to prevent your betta from becoming too cold. Filters are always necessary but make sure the current is not too strong for your betta. Bear in mind that the long-finned varieties do best with as little current as possible, while still having filtration. Some experts recommend the use of sponge filters, to protect the fins. Avoid jagged rocks or decorations. Such decorations can easily tear sensitive betta fins. It's recommended that you check once a day that there are no tears in the betta's fins. If there are tears, first check the water quality, as fin rot, often mistaken for tearing, are typically caused by poor water maintenance. Avoid adding any hard-plastic plants. Again, these can be rough on the fins. Use the 'pantyhose test': If a plastic plant will snag a pair of pantyhose when rubbed against it, then it will damage your betta's fins. Be safe and buy silk plants or live plants instead. Live plants are a great idea. They give a more natural look to your tank than fake ones, and betta fish love lounging on the leaves and hiding in them to sleep. Live plants also help to oxygenate the water and keep the water cleaner for longer periods of time by absorbing nitrates, which can be harmful to your fish. Betta fish tend to prefer being alone and may kill other fish and even invertebrates if added to the tank. Some calm-tempered fish can coexist with peaceful bottom dwellers like snails or corydoras. Shrimp tend to not be suitable tank-mates because bettas see them as food, and fish with bright colors and long tails can be bullied by your betta. Before adding any sort of tank-mate, do thorough research on both bettas and the other species to make sure the water parameters and size of your tank are suitable for both species. The article Buy Fish for an Aggressive Freshwater Aquarium can assist with choosing a tank-mate for your betta. If in doubt, leave the tank-mate out.
Prepare your betta's home. Choose a suitable home. Add the necessary equipment. Do research if you are considering adding tank-mates.