I had these this summer. All my acros were still on frag racks, so every 3 or 4 days I would dip every single one.
I use API Melafix Marine, about a cap full for 1/3 gallon of water. I would only dip each frag for about 30 seconds - if you look with a flashlight, you can see the bug start to get sort of paralyzed, then I would shake the frag very vigorously in the water to dislodge it. I don't know how long it would take to straight out kill it, all I cared about was getting them off.
I don't know their life cycle, hence the frequent dips. I personally wouldn't use a harsh dip, or dip for very long, because doing that over and over will probably kill the acro just by itself. I rinsed the acros in a seperate container, again shaking very vigorously, before returning.
I don't like Bayer, because I want to see them to make sure they're dislodged.
I noticed they were somewhat mobile - I had two separate frag racks, about 2 feet apart, one rack had them, then eventually the next one did too.
I also noticed they had some sort of apparent group attack, maybe a chemical signal or something. A Tyree pink lemonade start to stn, I dipped it and about 30 of them came off - that dipping session, no other acro had more than a couple, and a week or so before the pink lemonade didn't have any. This happened a couple times with different acros.
You will also see bite marks when you dip, and eggs.
Keep dipping for a couple weeks after you see the last one, just to be entirely sure - I don't know how visible the little ones are.
But, the pink lemonade lives to this day, and has grown over the dead spot, so they're certainly beatable.
If you have encrusted acros, either dip the entire rock or break them off, and kill/remove the encrustment. I think it's key that you break their life cycle, you can't have any little bits leftover sustaining them, it'll just drag it out. Doing that, I don't think you need to go fallow, or completely restart.
If you dip frequently, and dip every single acro every single time, they aren't the end of the world, it's just very, very, very, very tedious to do.