Sea Cucumber...rescued from sump, AGAIN!

[kosarfan]

Today I found my sea cucumber on top of my poly-filtration in my sump for the second time! There he lies with the water crashing down on him. The first time I picked him up w/a plastic spoon, dipped the spoon in the display tank water and he started moving. I set him down on the sand and he was as good as new.....within hours he had crawled to the top of the aquarium. Well 2 weeks later he found his way back to the sump...I'm assuming he crawls to the reservoir and gets sucked up by the siphon.
I am surprised he has made it through this ordeal twice. I heard they can release their innards if stressed, which can jeopardize the whole system...I can't imagine a worse stress than what he has been through. He is now cruising along the sand like nothing happened.
Has anyone else had this problem?
Anything I can do to fix it?
Here is his picture:

 

[kosarfan]

Here he is hanging out with my conch.
When I rescue him from the trickle filter he is smaller and loses his color.

 

[misty7850]

Oh, my.. I've been lucky so far in that my cucumber hasn't gone down the drain into my sump, but my smaller percula clown did. I put netting over my drain pipe to prevent it from happening again.