I had a 12g nanocube that I struggled with in the heat. Open the lid of your tank and run a fan over it. You'll have to add more water but it will help to keep the water cooler. Last summer I had a tank crash that I had to call my "fish soup" incident due to the high temperature in the tank. Unfortunately that is one of the down sides to an all-in-one contained tank.
With regards to your clownfish, it really sounds like over feeding. I agree with Skabooya.
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