I've been usinh my skimmer for about 5 months, it was used and came with the tank but never put it in since then. I was having issues with it overflowing so I took it out and scrubbed out the coralline. Now I'm getting way less skimmate, and the smell is so awful that it stinks up the entire basement like something is rotting on the beach. Even with a full cup of relatively dry skimmate, it never smelled this bad before. What should I do?