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I think you may be right - I found a website using the name you suggested and there's a picture that looks pretty close - Excerpt: "...spionids are somewhat rare in reef tanks. They may make an appearance by extending their paired tentacles from a small hole in a piece of reef rock...". Thanks...

Here's a picture (only comes out at night)

I just started my tank a couple of months ago. The other night, I noticed a long blue string on my rocks. It looked to be coming out of one of the rocks, and had stretched itself almost 5 inches to another rock. It looked liked it had little eyes, almost like a crab or snail. When I turned the...