Is my 2 gallon tank too small?

I am a new betta fish owner and I purchased a 2 gallon tank for him. It has an air pump, undergravel filter, and light hood. I have found that the light heats up the water very fast so since I live in florida found it easier just to leave it off. Part of the tank has a large silk plant for him to hide in as... show more I am a new betta fish owner and I purchased a 2 gallon tank for him. It has an air pump, undergravel filter, and light hood.
I have found that the light heats up the water very fast so since I live in florida found it easier just to leave it off.
Part of the tank has a large silk plant for him to hide in as well...
but I have heard that 2.5 is the minimum????? Is 2 gallons too small?
Update: I am more confused than before lol
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