Anemone dyeing only kill inverts?

[Sugarplum22]

I bought a BTA the day before yesterday from my local petco(the only place with saltwater near me unfortunately but it always looks nice and the fish always appear healthy) To remove the nem from their tank they were using a toothbrush(is that normal?) to scrub away at it to get it to detach from the wall, the first kid admired he'd never done it before and wasn't sure if he was doing it right so he went and got somebody else, anyway it took a good 10 minutes of them scrubbing it with a toothbrush to get the thing off the tank. I got it home and put the bag in my tank to adjust to temperature and did a small water change and then acimated it to my tank(it already wasn't looking great before I started acclimating) by the time I was done it didn't look any better but I placed it in the tank to see if it would improve, by the next morning it hadn't and when I got home from work it really didn't look good so I removed it from the tank. I noticed my feather dusters weren't out(they came in on some live rock) and there were a few dead bristle worms(I thought they might have been my feather dusters but was told they weren't) and a couple snails are dead I think, is this likely from the nem dyeing? My two clownfish are fine and the lawnmower Blenny is alive just hiding a bit more than usual. I plan to do a water change today also I've added carbon to the tank

 

[m0nkie]

doesn't sound like an BTA problem. They don't die that quick in tank and even if they do, they won't melt immediately to affect your livestock.

some pictures would be helpful. BTAs can look really bad at times, but doesn't mean it's dying

 

[Sugarplum22]

I don’t have photos it’s already in the freezer but it was for sure dead. It’s mouth was wide open it didn’t respond in anyway to being prodded and it was upside down. It also had a bunch of white patches on it and was covered in a film of mucus. Idk what else it could have been. That’s the only thing that changed my amonia and nitrites are zero and my nitrates were .5 ppm but like I said I’d done a water change and even after I took the nem out the water parameters are staying the same

 

[ClownNut]

how old is your tank?
salinity? temp?