Happy Boo to you, too!
Tank cracking... easy answer: at the percents I usually use, no FA flavors have cracked or etched even an EVOD.
More complete answer... Though they might not crack a tank instantly, some can cause problems with some kinds of tanks when used at higher amounts. Anise, Lime, and Peppermint, mixed at higher percentages, have all loosened the glue that holds some of my thicker plastic tanks together. A strong anise-citrus recipe cracked an EVOD tank sitting overnight. If you mix light and it doesn't sit for days, you might not have to worry about any of them. Personally, I just use glass for anything I'm not sure about -- anything with more than a hint of mints, spices, or acidic fruit flavors. Even some of those are fine, though. I've used Lemon Sicily regularly in plastic at 2-3% for a very long time and it has never caused a problem.