* Predatory nature: Turtles are carnivores or omnivores and often see small fish like neon tetras as food. Even if the turtle seems friendly, it might eventually instinctually hunt and eat the fish.
* Different water parameters: Neon tetras prefer soft, acidic water, while many turtles prefer harder, more alkaline water. Maintaining suitable conditions for both can be difficult.
* Stress: The presence of a turtle can stress neon tetras, leading to health issues.
If you're looking for compatible tank mates for neon tetras, consider:
* Other peaceful, small fish: Corydoras catfish, ghost shrimp, snails
* Plants: Provide hiding places and help with water quality.
Remember to research the specific needs of each species before introducing them to your aquarium.