Caught in the act

Towards the end of Erin's nap time, I heard a funny noise on the monitor. It sounded like something loud sort of banging, and I go in to see this:

Erin's done this before when she wants to get our attention, especially at night. The aquarium is quite loud and there's nothing like hearing the lullaby start and stop and start and stop. When she saw me taking pictures, she gave me this look, all "Who me?"

I've since learned very well what it sounds like when she's playing with her aquarium. It pretty much means that nap time is over.