Brittle Stars Fighting?

[keltic]

Recently I purchased a tank cleaner package from SWF that contained 2 Brittles. Is it possible these two would harm each other? I came home after work and saw that they were touching each other then noticed later that one of them had broken about 2 inches off its arm. Just curious if it was that or possibly something else. Thanks
55 G
45lbs LR
2 TR Ocellaris
1 Fat Blue Damsel
2 Brittles
1 Coral Banded
Red and Blue Hermits
Astreas

 

[ophiura]

Possible but very unlikely. How long ago was it? How did you acclimate them? Could have been hermits, crabs, even many fish....what are your water parameters?