I want to raise the specific gravity up a bit in my tank so I am going to top off with salt water. I usually use Tropic Marin salt however I have a small amount of Reef Crystal salt that I thought I can use for the top off. When I mix up the Tropic Marin in a bucket, it becomes clear after an hour or so. The Reef Crystal salt has been mixing up for 12 hours and it's still cloudy. Is this normal? Will it ever become clear or can I use it top off even though it's still cloudy?