you'll need to take out 10 percent of the water with a gravel vacume every week, or so(you can do it less if you have an algae eater and or invertebra...
Everything you need to know about setting up, maintaining,or even updating your (or your soon- to-be) freshwater aquarium!!
Step 1: Buying
you'll need at least 5-10 gallons to house your fish ( if considering buying a goldfish, or Betta fish, 4- 20 gallons, depending on the max. size, some get dang big, like 2', so ask the nice employees at petco!:) and they dont need heaters.). i have a ten gallon aquarium and it's just great, and only around $60 So go on petsmart.com or petco.com and find which size, shape and color is right for you. Once your at the store and have decided which tank you get, you need a heater and filter, and possibly a light, but most aquariums come with it, and don't forget the most important thing. Fish! I can't stress enough how important it is to do research on the fish you want to get.You do not want to sit at the pet store, to find out that " That one gets two feet long, or "That one is a saltwater fish" or "that's a cold water fish" and blah, blah blah. so research! (refer to step 2 for advice on fish)