Aquarium water pollutants come in many forms and can drastically affect the health of your fish. Uneaten fish food, waste, or even ordinary, unfiltered tap water (containing chloramine, phosphate, or nitrate) are just a few examples of items that may foul aquariums and compromise water quality. Contaminants like these can cause ammonia and nitrate levels to spike, create conditions that encourage aggressive growth of opportunistic organisms, or even chronic unhealthy conditions that lead to poor health.
One of the easiest ways to eliminate poor water conditions is to actively remove pollutants from the aquarium water. Removing phosphate and other pollutants in your aquarium water will also effectively reduce many of the nutrients algae needs to thrive.
There are several guidelines you can follow to help reduce pollution.
FEED only what your fish can finish within a few minutes. Excess food in your aquarium will create a surplus of nutrients.
SET lights on a timer so they are on no more than 6 - 10 hours a day for aquariums without live plants.
USE tap water conditioners that neutralize ammonia, nitrate, and chloramines or use filtered water such as reverse osmosis water.