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Yesterday he was moving but every time he tried to he just did like a backflip, today he's been sitting at the bottom of the tank not doing anything also he didn't eat, also i add a few drops of methylene blue. ------------------- Yes i replace the whole tank every two weeks, because i used to...

My mom had another 20L tank laying around so i put the injured fish there with this kind of filter

I used to change 10% every week but the surfaces inside the tank started to grow a brown thing and i just replace the whole tank every 2 or 3 weeks

Yes that's the reason why and with all this coronavirus chaos it takes 2 weeks for a test kit to arrive

Request Help Tank size: 20Liter pH: N/A ammonia: N/A nitrite:N/A nitrate:N/A kH:N/A gH:N/A tank temp: 25c Fish Symptoms (include full description including lesion, color, location, fish behavior): I have two Koi fish that my girlfriend gift me about a year ago, two days ago i notice that one...