In 2 weeks IF my son keep's his room clean me and his father are....?

buying him a large starter fish tank with fish. but its a suprise!! inorder to get this suprise he has to behave in school and clean his room nightly for 2 weeks! ..........we are on day 2. PLEASE keep in mind that he is 5 year's old!. .........every night after his room is picked up we tell him a hint about his suprise. sun - *you have to feed it, mon - * they come in many colors and size's......................i need help from you guys to think of more fish related hints for the next 8 day's! (not including weekends).............. do u understand? i need fish hints for my 5 year old's suprise! thanks