Introduction:A visitor recently asked me how many times I had to change my aquarium's water to keep it as clear as it is. When I responded "none" she seemed incredulous.
The key to clear water is maintaining a balance.
One of the biggest banes to aquarists is that creeping green goo that coats the inside glass and any surfaces like rocks, decorations, etc. A new aquarium should not be set up in a location where it will receive more than a few hours of direct sunlight. Also, the aquarium light should not be left on for long periods of time.
One of the two primary rules of aquarium keeping is "do not overcrowd". Figure out the carrying capacity for your tank - the rule of thumb is usually one inch of fish per gallon. Exceeding the limit risks a stress on resources that will result in cloudy water.
The second primary rule of aquarium keeping is "do not overfeed". It's tough rule for beginners, or children as it is fun to watch fish eat. However, uneaten food sinks, rots and clouds the aquarium. The rule of thumb is only to feed what they can eat inn 3-4 minutes.
REAL plants (as opposed to plastic, artificial ones)will absorb a lot of wastes. Scavengers, including Corydoras catfish and snails, will eat a lot of the food that settles to the bottom. It's all part of trying to duplicate a functioning ecosystem in miniature
But you CAN give her a helping hand. Make sure filter mediums are changed regularly and most experts do advise a monthly 20-25% water change to remove built up, hidden wastes like ammonia. Algae magnets are excellent tools to get rid of algae from the inside glass without getting your hands wet.
select one here...