the title says it all. but what im wondering is if it can be used on saltwater. the product info says its "ideal for most all freshwater aquariums." and hypethetically speaking, what if i bought it already for my 75gallon tank im setting up? because i may have read the title and "Caribsea" and assumed it was for salt. i can send it back if i need to, but would be easier if this works. any thoughts? link: https://www.petsolutions.com/CaribSea-Insta...420832+C45.aspx