So I went to my local saltwater aquarium store and I got some RODI water in my seven gallon container, and when I got home to test it with my meter it reads 150 PPM. I also have some distilled water that I bought yesterday and tested that and it reads 0 PPM so I know my meter is not broken. I'm new to reefing and recently set up a 20 gallon AIO tank. What should I do?