Ick on hippo tang?

[justintime742]

I have had this baby hippo tang for close to 3 months. Never showed any issues until this past week. She is frequently scraping on rocks/shells, but other than that is pretty normal. We did have a starry blenny who for whatever reason, attacked all my fish and killed my watchman in my aquarium who was quickly brought back. I have 2x snowflake clowns, 1 solar fairy wrasse (who has white dots on his tail), a watchman and a pistol shrimp, orchid dottyback, a Pygmy African angel, and a biota captive-bred mandarin. None of which show any signs of what the hippo has other than possibly the wrasse? No new additions since the starry blenny other than corals that were captive fragged and coral dipped before introduction. I’ve reached out to my LFS who is pretty good about getting back to me about the situation but haven’t heard back. Any advice welcomed if I have to set up a hospital tank, anything to just not lose any fish or corals in the process, thanks in advance.

Parameters:
Salinity: 1.025
Nitrate: 10ppm
Calcium: 450
Alk: 11dkH
Mag: 1250ppm
pH: 8.0


Edit: I have tried to introduce a tomini tang, my LFS replaced my first attempt due to him concerned it may have just been an unlucky one that randomly passed 2 or 3 weeks after being in the tank, and the second one randomly died off a week after introduction, both were eating and swimming no problem, no visible issues or anything that we could figure out. No visible problems. I do have a rock anemone thats in the sandbed, unsure if that could cause an issue, but hasn't proven to be a problem to any other problems. Also have a ECC sherman BTA that host my clowns, and a ECC rainbow inferno BTA.