Are you dry docking him, ie putting him in a dry plastic box under a heat lamp, with space for him to move away from the heat for part of the day? The box must be deep enough so that he can't get out, won't melt, and the lamp must be fixed securely so that it cannot topple over.
Swimming upside down is not a good sign. In between dry docking I would be putting him back overnight into very shallow water. What is the depth of the water he is currently in?
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