When a tank is first started fish waste and excess food begins to decompose at the bottom. One type of bacteria breaks it down to ammonia, which is highly poisonous to fish. Then a second type of bacteria breaks down the ammonia to nitrites, nitrites are also moderately poisonous to fish in small amounts. Lastly a third type of bacteria converts nitrites to nitrates which are not harmful to fish but build up to toxic amounts generally within a few months. That is why 20% wa

The ph value in a tank doesn't generally matter for basic to medium aquarium hobbyist. As long as it is between 6.5 and 7.2, ph ranges from acidic to base water. Some fish however like higher more acidic ph values, where as some fish are very stressed in acidic water and are more susceptible to disease and death. Temperature is very important to maintain to a certain extent. Most tropical and salt-water fish enjoy temperatures from 68°F-78°F. It is essential to have a heater in your tank to maintain the temperature. Salinity is important to monitor and control in salt water tanks. You should have no salt in a freshwater tank. Salinity in a salt-water tank is there gravity. If the level is too high fish will sink to the bottom and probably die. If it's too low they will be stuck at the top.

If it were not for

Some common words found in the essay are:
Science Fish, , fish keeping, type bacteria, ammonia nitrites, fish keeping science, bacteria breaks ammonia, type bacteria breaks, fish tanks, 21 days, tank doesn't, excess food, bacteria breaks, keeping science, poisonous fish,
Approximate Word count = 555
Approximate Pages = 2 (250 words per page double spaced)