Tiger Tails
Taken straight off LA's website about Tiger Tails:
"Caution: Cucumbers must be maintained with peaceful tank mates to avoid potential accidents. Although this species does not have tubules of Culvier, if attacked by aggressive fish or injured by unsecured pump intakes, it will expel its internal organs, which may be toxic to fish."
From what I have seen this one is the best to have in your system IF you are going to have one but you are still running a risk.
Rod