I have a 20 gallon aquarium and have always had problems with ammonia build up until I found the right setting for my tank. My filter construction: SunSun Hw303B canister filter: https://www.amazon.com/gp/product/B00896IILA/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=paperink-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00896IILA&linkId=d47ce68abecca top layerd of carbon ILA&linkId=d47ce68abecca d47ce62abfccac668bee089d8 and ammonia mixture in a bag. Not at petco, by the way, it's much more expensive. Второй слой я использую Seachem Bio Media: https://www.amazon.com/gp/product/B0033Q1U7A/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag= paperink-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B0033Q1U7A&linkId=788f1db59f79fb58cda3fc32296080f5I would soak it in Safe Start (bacteria) for about 30 minutes : https://www.amazon.com/gp/product/B002DZNP3E/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag =paperink-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B002DZNP3E&linkId=34a4ae3bab2e3c64801dc84200c4e9b9Нижний слой, я просто I put all the coarse and fine sponge in the filter. Remember to NEVER use chlorinated tap water in a filter without treating it with a conditioner. Conditioner: https://www.amazon.com/gp/product/B00176CVK8/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=paperink-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00176CVK8&linkId=022531cc398165d90b737a2d
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