The Ritteri was sliming abit when Tony was trying to extricate him from a large rock that he was attached to ... he obviously did not like the idea of leaving that rock

... I cant see how that anemone could cause that much damage but obviously has some serious defense mechanisms
When we moved my whole tank a couple weeks ago I had to use a ice cooler and a plastic knife to wedge my large GBTA off the back of my tank and did not experience anything like this ... the buckets that the fish/anemones were in actually dropped quite abit in temperature and we did not have alot of time to reaclimate them to the new tank yet all survived.
This slime from the Ritteri has to be the cause and is seriously poisonous
I am so sorry for what happened Tony ... I feel just awfull ... I will have my sump/skimmer up and running in the next couple days so I will volunteer to provide a temporary home for your anemone < I say temporary because I would like you to take some time to reconsider getting rid of it altogether as the disappointment of the loss of fish is too fresh in your mind >
Please consider my offer before you decide on anything
If you still decide to get rid of it I will take it as well but only if you let some time pass and get a chance to regroup and reconsider
Regards