Keeping freshwater turtles and frogs together in the same aquarium is not recommended. 

Safety Concerns:

• Predation: Many turtles are omnivorous and may view frogs as prey, especially smaller frog species.
• Injury: Even if a turtle doesn’t eat the frog, its claws and strong beak could injure the frog during competition for food or basking spots.
• Stress: Frogs tend to be more sensitive to water quality fluctuations and stress compared to turtles. Sharing an environment can add stress to both creatures.

Habitat Differences:

• Basking Needs: Turtles require a basking area with a heat lamp to regulate their body temperature. This warm, dry area might not be suitable for frogs, who prefer cooler and more humid environments.
• Dietary Differences: While some overlap exists, turtles and frogs may have different dietary needs. Turtles often require a higher proportion of plant-based matter than some frogs.

Exceptions (with caution):

There might be a few rare cases where cohabitation could work with extensive research and a very large aquarium. Here are some requirements:

• Large and well-established tank: The tank needs ample space for both species to avoid territorial encounters.
• Specific frog species: Only choose large, robust frog species known to coexist peacefully with turtles. African Clawed Frogs are not a good option.
• Abundant hiding spots: Provide plenty of hiding places for the frogs to escape interactions with the turtles.
• Close monitoring: You’ll need to constantly monitor the tank for any signs of aggression or stress in either animal.

Alternatives:

• Separate tanks: If you’d like to keep both frogs and turtles, it’s safer to house them in separate, species-appropriate aquariums.
• Focus on one species: Choose to keep either turtles or frogs solely to ensure their well-being and provide them with the optimal environment.