Eleyan, I'm more concerned about your pump..... Isn't that a pond pump? Are you sure it is safe to use in saltwater? The inner workings of some pumps can corrode in time and wipe out your entire tank from leaking oils, heavy metals and other things.... Maybe a mag 9 would be a better choice or another pump suitable for saltwater. Again, I could be wrong, but I have not seen a laguna pump reccomended for saltwater use.