The treatment is not that big of a deal. Get out whatever inverts you can. I got out my emerald crab but left my cleaner shrimp and porcelain crab.
Treating 1/16th of a large dog tab in a 20L, the porcelain made it and the cleaner did not. I also didn't do the first water change until 30 or so hours after treatment, which I feel contributed to the death of the shrimp. I didn't do the 2nd WC.
My second treatment was smooth as silk, porcelain was fine, no sign of the bugs. Did both prescribed WCs this time.
Debating a 3rd treatment. No sign of the bugs and my corals are bouncing back quite nicely. I was sure that several of my frags were toast, but they're getting PE and color is improving every day.
You'll be fine.
edit: No acro crabs here, so I can't offer advice in that area.
IME, vets don't want to write a scrip but they will sell you the meds. I took the summary by Dustin Dorton to a local vet, explained it to his nurse and she went and talked to him. He was OK, sold me the meds and told me to come back whenever I need to.