I had seen them in a video and didnt look all that big to me, but they can get uo to 3 foot in length! I dont think i will be wanting any of those in my 180.....LOL
Grunts, atleast what I have seen around here, act in the same way as most snappers or groupers do (well the majority of them, but probably not all). They are greedy eaters!! You go fishing and you are bound to catch a couple of grunts no matter what type of bait you use LOL! With that said, if you go with a school of grunts, keep it in mind that waste will be on the higher side than most other fish.