I read the thread a couple days ago about which salt to use, and about using aquarium salt to make the crab water as close to real salt water. I also looked it up online to see and it says usually crabs like water that is about 1/2 the salinity of ocean water. So, I am fortune enough to live by the ocean. Would it be okay to use actual water from the ocean and mix it with purified water to cut down the amount of salt by some? Good Idea / Bad Idea??