are they dead?

[mpishi]

a few days ago i had a heater fail in the on position

ironic since there was just a thread about that

tank went over 90

clownfish, damsels, mushrooms, polyps all seem okay

xenia melted off rocks and became mush on floor and were siphoned out

here is the question

devils hand, toadstool and cabbage all are shrivelled and look like crap
no expansion or tissue movement
very hard and shrivelled
no mushy tissue at all
been 4 days now
so are they dead and should i chuck them to prevent an ammonia spike
nitrates still reading okay