a 55 would be good for a while but be willing to deal with up to 18 inches of shell with quite a bite. it should take about 5 years to reach 8" so you will have a while before you will have to deal with a larger tank. keep it shallow for easy access to the surface for food and air. keep a nice filter like a whisper 40i it is an internal filter so you can keep it inside the tank with the water low. as he gets bigger you may have to get another one. don't keep the water deeper than twice the shell length. allow basking but don't expect to ever see him baskin, at least not much. full spectrum light is a good idea for the whole tank and allow multiple hiding caves. vary the diet. he should accept pellets. remember that feeder fish may carry parasites and disease so at least keep them in a seperate tank for about a week to get them nice and plump with nutrition and monitor for disease. good luck. just list any other questions.

Brian

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