What if I lie to my roommates about cleaning my aquarium filter in the kitchen sink?
Why do you want to lie about cleaning your aquarium filter in the kitchen sink?
Because I want to do it in the middle of the night without telling anybody
It's understandable that you want to do something that's convenient for you. It's usually not a good idea to lie to your housemates, as it can make them mistrust you. However, if you're lying about something small and they are unlikely to find out, then it's not that bad.
Screw you, man. It's just a little lie.
Why would you lie here though? Did they tell you to never clean the filter in the sink? Either way, you need to just confront your roommates and work out a workable solution.