Since your ruler The Moon provides the only light in the night sky, your sign sometimes needs to be cautious with money.
There may be hidden expenses lurking in the darkness, or just fees and policies you're not aware of.
Empowering yourself with information throws a light on anything hidden. Similarly, your Water element can make money flow through your hands, if you're not careful.
Using this to your benefit may mean picking investments intuitively, and making sure to diversify your portfolio. That's what safe investing looks like.