How often should i do water changes and how much water, and how often should i test the water and what should i test it for, when is the bacteria established enough to get more fish, what should i do if there is an ammonia spike, what happens next when the bacteria has transferred the ammonia into nitrite
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If you answer these questions you are a legend
You need to buy a good LIQUID test kit! Either a Salifert test kit, or an API freshwater master test kit! A basic test kit tests for Ammonia, Nitrite, Nitrate and pH. For your cycle, ammonia and nitrite are going to be the most important, followed by Nitrate and pH.
You do a water change if the ammonia and/or nitrite are above .25 ppm.
You check at least twice a day, once in the morning and once at night. When you check in the morning, and the ammonia and/or nitrite is above .25 ppm, you need to do a water change to lower the ammonia and/or nitrite level down to or below .25 ppm. Then you check again in the evening to make sure the ammonia and/or nitrite are not above .25 ppm, if they are, then a water change is in order!
You will most likely be doing about 2 50% water changes daily for a couple of weeks.
When you are getting 0 ppm of ammonia and nitrite for one entire week, without doing any water changes, then your tank will be considered cycled!
After ammonia is processed into nitrite, it is then processed again into Nitrate. There are no bacteria that process Nitrate, so weekly water changes (one your tank is cycled) is done to keep the Nitrate level down. I would not expect your nitrate level to go above 40-50 ppm.
Ammonia is toxic to fish if over .25 ppm
Nitrite is toxic to fish if over .25 ppm
Nitrate is toxic to fish if over 400+ ppm (Try not to allow nitrate to go above 40-50)
Hope this helps!
-FHM