Whats a good filter for a Male Blue Neon Guppy in a 1 gal tank?

I know its not recommended to have fish in such a small tank but im not looking for anything major at the moment because I have school im 14 and I have had 2 bettas and the lived 4 years without a filter which was suprising because I was a stupid 9 year old and my mom just wanted me to shut up I was thinking about... show more I know its not recommended to have fish in such a small tank but im not looking for anything major at the moment because I have school im 14 and I have had 2 bettas and the lived 4 years without a filter which was suprising because I was a stupid 9 year old and my mom just wanted me to shut up I was thinking about the Tetra Whisper but idk if it will fit my 1 gall hexagon tank
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