My Pearl Gourami female is sick!Please helppp!

Jul 21, 2009
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My aquarium: -60 litters
-heater, white light bulb, water filter
-fishes: 1 pearl gourami, 2 sunset gourami and a betta male
-5 plants
-water temperature around 82 Fahrenheit(28 Celsius)
-water parameters: 0 ammonia, 0 nitrites, 0 nitrates, PH:7.8

I have a problem with my preferred female Pearl Gourami .She just lays around the middle of the tank and doesn't swim much (usually she’s very active and swim a lot).
But the real problem is that she doesn’t eat anymore, she tries but I she can’t! Whenever he tries to eat he pretty much swims up to the food and acts like he’s going to eat it but just swallow the food and immediately she spit it out! So she tries to eat but something makes it to spit food out! Either she doesn’t like that food anymore, or is something physical! Usually she was very active and ate very, very well, now she doesn’t swim much and not eating almost anything! That behaviour starts with 3-4 days ago!

PS: She doesn’t have until now any physical signs of disease! Honestly, I had so many problems with my fishes until now (I bought it with 3 months ago) as I think to give up with this hobby!