Here's why:
* Plecos are generally peaceful: They are primarily algae eaters and not typically aggressive towards other fish.
* Other factors can cause fish death: Poor water quality, disease, overfeeding, overcrowding, and incompatible tank mates are common causes of fish death.
* Specific pleco behavior: Some larger pleco species can become territorial and may occasionally nip at smaller fish, but this is uncommon.
To determine the cause of fish death, you should consider:
* Water parameters: Test your water for ammonia, nitrite, nitrate, and pH levels.
* Tank setup: Ensure the tank is large enough, properly filtered, and has appropriate hiding spots.
* Diet: Feed your pleco algae wafers and vegetables.
* Compatibility: Make sure your pleco is compatible with other tank mates.
* Observation: Watch your fish for signs of illness or aggression.
If you are concerned about your fish, consult a local aquarium expert or a veterinarian who specializes in fish. They can help you diagnose the problem and provide appropriate solutions.