Class Identification

Something I have always struggled with in Healbot, and have never come up with a setup solution that was satisfactory to me, is a way to positively identify who the warlocks are. This is really only an issue for me when healing Alterac Valley, but it's a real problem. I'll be healing 20 toons in the middle of a crazy fight. About all I have time for is to watch for damage and throw an appropriate heal, and then a warlock does a few Life Taps and I'm wasting my precious mana topping off his health. Ideally, Healbot would detect the life tap and flag that toon for the duration, but just a way to obviously identify the warlocks would work too. One thing that occurred to me was that if Auxiliary Bars could be used to depict class by color, that would work, or, a bar border that depicts class. I have tried coloring bars by class, but it makes the display so "busy" that it slows down my response time considerably.

Thank you for the replies. I have experimented with altering the background color but my brain apparently doesn't have the power to process the resulting display very well. I am now looking into a way to :"cast" a blacklist on a warlock who Lifetaps on me. I have no experience with the blacklist function but I imagine it will be useful.