Hey! Umm... I have a betta fish (Got him Feb 24, 2009) and i have a question?

[sTuFf]

like i said I have a betta fish (Got him Feb 24, 2009) and i have a question with his tank??i mean its like he never dirty's it!! is that normal because i haven't cleaned his tank since April and i m kinda of worried? i give him 3 pieces of Betta fish food every morning and he eats most of it but i want my fish to be all right and he is a male, his name is Prince Applesauce.. so please help me with Prince AppleSauce