How long have you had the fish for?
How long has it looked cream/ white?
Have you added anything new to the tank in the 2 weeks before this started?
Is it eating normally?
What does its poop look like?
Has it been dewormed?
Is it male or female?
Is it breeding?
Can you post a picture of the other one so we can compare it? Try to get a side view of both fish too.
What is the ammonia, nitrite, nitrate and pH of the water?
How often are you cleaning the filter?
How often are you doing water changes and how much do you change?
How often do you gravel clean the substrate?
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The creamy white stuff is excess mucous and appears to be all over the fish (head, body and fins). Fish naturally have a thin layer of clear mucous over their entire body (including head and fins). It helps them move through the water and acts as a first line of defense. If they get a wound or the water quality goes bad, they produce more mucous that appears as a cream, white or grey film over all or part of the fish.
If there is a cream, white or grey film over the entire fish (head, body and fins), it's normally caused by poor water quality.
If there is a cream, white or grey area/ patch on the fish, it's either got a wound or an external protozoan infection like Costia, Chilodonella or Trichodina.
The fact only one fish is showing it over its entire body and the other fish look fine would suggest that particular fish is either more sensitive to water quality or something in the water (compared to the others), or it has a major health issue making it feel stressed and unwell.
How long have you had the fish for?
'Bout half a year
How long has it looked cream/ white?
at least 3 days, starting from last sunday i think
Have you added anything new to the tank in the 2 weeks before this started?
I changed water this monday, which is one day late than i usually do, I also got new plants but they were all emersed grown
Is it eating normally?
Yes
What does its poop look like?
I haven't seen but i don't see any stringy stuff either
Has it been dewormed?
not yet, but I can try the food method.
Is it male or female?
Female
Is it breeding?
Yes
Can you post a picture of the other one so we can compare it? Try to get a side view of both fish too.
I'll get that as soon as I get back home again
What is the ammonia, nitrite, nitrate and pH of the water?
I haven't tested in quite a while but I will try and test today.
Usually these are all zero and pH is around 7.8 or so, but maybe the new water that I changed was different, causing the stress
How often are you cleaning the filter?
once a week, it gets very dirty from the duckweed and live plants
How often are you doing water changes and how much do you change?
How often do you gravel clean the substrate?
