they were a musty greenish brown, and yes, they fed livestock. they found this place that sells fish in california (we're in ohio), that sells fish rediculously cheap. i think he said he only payes like... 0.31$ a damsel. and i saw the brittles (which climb into the filter) stick a tentacle in a loop and wait for damsels go though, never saw it catch one, but once i saw it with the damsel wrapped up, and the brittle was half over it eating it, while the damsel was having like... convulsions? (don't know if its spelled right), the damsel just kept shaking rapidly.
and i saw the bursa rip apart a brittle, but didn't see the brittle kill the bursa, they said it happened over night...