I have a Cleaner Shrimp that is doing a great job on every fish in my tank, but my tang. He cleans both of my Clarkii's, the Anthias, and I've even seen him clean the gobies, but he won't touch the Kole Tang (Bart). Bart swims down next to him and patiently waits for the cleaner to jump on, but the cleaner refuses to have anything to do with him. Aside from rubbing bacon grease on Bart, does anyone have any suggestions?