I feel like 88 degrees for water temp is way too warm, if you provide a basking sight with UV and a surface temp of roughly 100-115 degrees, then regulating his metabolism should be too difficult. Also 3 weeks may not be long enough for him to be completely settled in to his new environment, so give him more time. I would also try leaving food in there unattended, he may be more inclined to eat if he's left alone.
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