They may have some chemical method of not shooting nematocysts into their own arms.
Clownfish secrete a chemical that keeps sea anemones from sticking to themselves; maybe it works something like that.
Although in the aquarium in question, it seems they are always tangled.
Oh no, these have been building up for a while now. I'd say a year or so.
And since I live in Southern California, I'm only 60 minutes away from Sea World, Aquarium of the Pacific, San Diego Zoo, and San Diego Wild Animal Park. Lots of opportunities.
Thanks for the lovely compliment!!