None of my brittlestars, including a very large green one, has ever bothered any of my cucumbers. Brittlestars have such a good sense of smell that they will usually come out to check out any new additions (coral etc) to the tank. They may look like they are attacking it, but, they rarely do any harm once they have figured out what it is.
I have never heard of a tiger tail poisoning a tank. I have seen pink ones do it, but, only ones that had been sucked into powerheads. The cucumber was OK, but, every fish in the tank was dead. I had one die unstressed in my tank and it did not hurt anything.
I would be more worried about powerheads than brittlestars. Make sure all pump and powerhead intakes have a screen on them.
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