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Welcome to the forum Sherry...we need some more information and maybe we can help you figure out what is going on...
In the 5gal-is it filtered, live plants, water temp, how much and how often are the water changes, appetite, any tank mates.....what kind of symptom is he having.....how long have you had him...
Generally-you want to try and keep a somewhat stable temp in the 76-80F range, a healthy Betta can usually tolerate higher and lower temp short term without any issue and the gradual day and night temp changes are normal and tolerated usually...
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