Where o where has my rbta gone...?

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I recently purchased a ricordia attached to a piece of live rock that had a little rbta attached as well. The seller did not want to yank it off and cause harm to the rbta, so he left it on.:celeb2: The little rbta had been doing great, but one morning, he was gone completly. It has been two days, and I have not been able to locate him. Do you think he walked away under the rocks or in back of the tank or do you think this rbta has bitten the dust?

I have another rbta in my tank that is large. This RBTA has not moved or shown any problems.