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You can skip the carbon in the filtration if you want, I used to use it every other month. Or you can use chemipure elite which lasts for multiple months, thats what I use now. If the sponge is icky you can rinse it in tank water but otherwise I would just leave it.
2nd week of my tank, did a test using api master test kits, and results are as follows, high ph=8.0, ammonia=0.25ppm, nitrite=0.25ppm, nitrate=10ppm. Can anyone tell me whats goin on
Are you dosing with ammonia? If so, you need to keep re-dosing to get the bacteria to grow. Get it back up around 3-4ppm. When it processes the 3-4ppm ammonia and nitrItes into nitrAtes in 24 hours, you are ready to do a big water change and add creatures!