This could be due to several things, including:
- Poor water quality: Ammonia, nitrite, or nitrate levels that are too high can make fish very stressed and disoriented. Have you tested your water recently?
- Disease or parasite: An infection or parasite could be causing discomfort and erratic behavior.
- Injury: She might have already injured herself, and the hitting is a result of pain or disorientation.
- Stress: Changes in tank environment, new tank mates, or even loud noises can stress fish out, leading to this kind of behavior.
I strongly recommend doing a water change immediately – at least 25-50% of the tank water. Then, test your water parameters (ammonia, nitrite, nitrate) using a reliable test kit. If the levels are off, you'll need to take steps to correct them. If you don't have a test kit, please get one as soon as possible. This is crucial for your fish's health.
If the water parameters are fine, then a disease or injury is more likely. I would suggest searching online for "Zebra fish diseases" and looking for pictures to see if you can identify anything. If you suspect a disease, it's best to consult a veterinarian who specializes in aquatic animals or an experienced fish keeper for advice. They can diagnose the problem and recommend appropriate treatment.
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