This year, you go as an undergravel filter. Don't worry about the air pump, you already have a powerhead.
Collect a pile of chocolate bars, eat them, and next year, go as a box filter.
I used to believe in any holiday that got me a day off work. Hallowe'en didn't qualify, but I loved giving out candy to kids, who were generally having a great time. Now, you have to picture this. I live across the road from a long established, creepy old graveyard. I have a long dark driveway up to the house, and as you come up, to the side you see the neighbour's semi abandoned farmhouse. We haven't had a kid come up here in years.
It couldn't be worse if the house had towers and wrought iron everywhere, as even a 1990s bungalow is too scary for trick or treaters. Even the reindeer are too scared to come here in December.
So movies? Watch a bunch of below water fish videos, and then contemplate what your bank account would look like if you had all the set up they make you imagine having.... scary...