dead cucumber

[Trigger Man]

Ya you are going to have to get all the water out and do tonnes of waterchanges as well as use a tonne of carbon. I was talking to Golds aquariums about cucumbers and sea apples and they had mentioned that when a sea apple died in their tank even with completly changing the water a few times they still had problems for a while. I had a cucumber take out one of my tanks a while back and I cleaned out the tank completly and tossed out all the rocks just incase (problably over reacted). I have used the tank for qting a couple of times and all of the fish I put in it had no problems.
Good luck with the restocking.