Update: 7 hrs after 2.3mg dose of interceptor hermit and mythrax crab die within minutes of each other. I actually saw the mythrax die, it seemed that it threw up a red dust and then fell off of the rock. Terrible I know, but if documenting what happened, thats the grisly truth.
Also, snails, bristles, peanut, tube worms, fish, coral, serpent star, urchin all appear fine. No sign of any red bugs on my acros. Last night they were hard to miss. Pylop extension on the worst infested stag is back to normal. Seems kinda quick but I am not complaining.