Turtles need really beefy filters to keep their water clean, think 4-5 times the volume of water per hour. They also need UVB lighting to help them with their growth. You have to think in terms of practicality when it comes to designing their habitat. Any other living creature in their tank will become food, sooner or later. Plants will be eaten, or trampled. Also, a 55 gallon will probably last your 2 turtles for their first year or so before it needs to be upgraded. Red Eared Sliders can reach up to 12" fully grown.
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