Well, why did you remove it from the cat? The paws need the rest of the animal to live:mrgreen:
What are your parameters?
It is a SPS so very sensitive to nitrates and phosphates. Also, if you got it online, I would contact the seller and see about getting a refund.
Does it have enough light?
How did you acclimate it?
some pics might help
Keep the water quality up and it might pull through.