I absolutely agree; people really should get more information on the pet they plan to own instead of making a blind decision. Unfortunately, with pet stores putting sales as priority over the care that the animals will receive, often people jump blindly into a decision. Fish especially are made out to be an easy pet to own. It is very sad that a lot of pet stores use this tactic to boost sales. An animal should be bought with intention to care for it, and not on a whim.
The filter system I use is the Tetra 25775 Whisper. I generally take out about 15% percent of the water in the tank more or less when I do water changes, once per week. If you have any suggestions for making this setup better let me know!