Well, I now have a possible solution for Flipper, a wiffle golf ball half! Posting pics and maybe a video. If video does not upload, please reply with your email and I will send to you. This seems to be a good solution to the flat shell. It is light-weight, allows air to most shell, and seems to help him keep upright. Let me know what you think!
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Great idea....I would just keep an eye on the way the other torts treat him with that mysterious, perhaps edible p ) thing on him...lol....