I have a beautiful Violet Goby that is about 8 months old and 11+ inches long. Got him at about an inch and a half. The people in the store know nothing about Goby's. They had him in fresh water, so I did not realize until recently that he should have brackish water. Not sure how to accomplish this. I want to have him for many more years. Have read they live longer...up to 15 years in brackish water. Help....