Hang External Aquarium

Hang External Aquarium

goldfish~! help~!~!?

before 70% water change parameter is nitrate250, nitrite10, ph 6.4, but after 70% water change parameter is nitrate100, nitrite10, ph 6.4.

(1) what can i do to bring the nitrate & nitrite to zero?
(2) is it really necessary to add anti chlorine & anti chloromine to my aquarium?
(3)how often shld i change my filter sponge in my external/hanging filter?

1. continue with partial water changes. make sure your filter is working correctly and you're not overstocked.
2. yes. chlorine and cholamine is toxic to fish.
3. the filter sponge or media contains the essential bacteria needed to keep your tank stable. it should only be changed completely when your tank has suffered a lethal outbreak of something and you've lost your fish or you want to entirely restart your tank. replacing this media will cause your tank to start a new nitrogen cycle.

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