Tonight, I see that my amazon puffers are coming to surface, other fishes act normal but only amazon puffers are coming to surface also one other small fish too.
it does not look they want to breath there becuase they are not 100% on the surface but few mm below the surface, but all four of them act the same way. please see photo.
I did water change yesterday and ammonia, nitrite and nitrate are all zero . water temp is also fine. I do not know why they do this behavior, I do not see any sign of sickness like white spots. I also did not add any new fish today.
What could be the problem and should I do another water change? I also have some medicine leftover from the 6 months ago curing ich, should I use that medicine again?
please help.

I should mention that I only added two leaves, I mean those aquatic leaves into the water tonight.
it does not look they want to breath there becuase they are not 100% on the surface but few mm below the surface, but all four of them act the same way. please see photo.
I did water change yesterday and ammonia, nitrite and nitrate are all zero . water temp is also fine. I do not know why they do this behavior, I do not see any sign of sickness like white spots. I also did not add any new fish today.
What could be the problem and should I do another water change? I also have some medicine leftover from the 6 months ago curing ich, should I use that medicine again?
please help.

I should mention that I only added two leaves, I mean those aquatic leaves into the water tonight.
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