It SPAWNED..Now..What is it??

I should probably know what this is. I have never seen it in my reef before today. I havent added anything to my tanki in 1 year or so. I assume that it isnt bad, since I havent had to many problems. I saw it out on the rocks about an hour ago. I thought at first it might be a baby sea cucumber, but then I noticed that it has a hard fleshy "shell" and a foot. Anyway, I wasnt sure if it was good or bad so I captured it to take pics to post. I put it in a baby "guppy" breeder that I had and after a few minutes it statrted to spawn. It raise one end up in the air and curled the end like a person curls his tongue, then it started to release thousands of small white things. I cant believe that it could possibly have that much inside. It os about 1 1/2 inches long. It is still spawning as I write this. I need to know what it is and whether it is good or bad. If good, I will release it and let the spawn out with it, Any ideas??? Thanks.

 
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