It's what men, manly men, men with actual whiskers on their face, do.
It's not what a 12, almost 13 year old boy who doesn't have one single teeny tiny resemblence of a hair that would need to be shaved, should do. I'm not trying to keep you from experiencing an important rite of passage, but if you can't even remember to brush your teeth and wash your face on a daily basis - how are you ready to shave?
Also, please see exhibit A: you don't have facial hair yet.
They are stinky and gross and when not cleaned regularly, become quite disgusting. The deal with the fish tank was that the boy would clean the fishtank without needing to be asked fifty billion times.
They are not what moms want to clean.
Also, moms don't like to get those tiny fishtank rocks in their garbage disposals. So please don't hassle a mom (that would be me) when she offers to help so that the disgusting job of cleaning the said fishtank is done properly and without ruining her garbage disposal...which she relies heavily upon to dispose of the leftovers her kids leave on their plates.
Those are for the birds.