Taking care of fishes in Aquarium

Well, you must make sure that you clean the aquarium frequently. At the same time you must change the water once in a week or few days and remember to put the chemical liquid that functions to kill bacteria, parasite and another liquid to improve the quality of water for fish to live. Sorry I don't know how to call those liquid. You can ask about it to any home fish seller. Fish is very fragile and easy to get sick.