I've got a res and a cooter in a 100 gallon tank. I keep it almost full with water so they have alot of room to swim. Probably 4-6 inches from the top at all times. For an island, I used a piece of acrylic from Lowe's, heated and bent it so they can climb up. Then I used aquarium safe epoxy and attached pieces of acrylic to the side of the tank so I could lay the island/ramp on top and epoxied it down. Below the island is water so there's more room to swim.
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