If you really want to find out what it is then here is an invasive technique for you to try. This works well for mantis removal too.
Get some 1/4" or 1/2" nylon mesh screening and make a simple wood frame and staple the mesh to it. Pull the rocks out of the tank where you think the critter is and place the rocks on the mesh screening. Underneath the mesh place a tupperware container full of saltwater. Mist the rocks regularly with saltwater and a spray bottle to keep the bacteria and coraline alive. Eventually whatever critters are in the rocks should eventually seek the water and fall through the mesh into the container below. This could be a long process taking a day or two. Just an idea. The problem is that it requires you to remove the rocks from your tank which can be a bit invasive. Just throwing out a suggestion.
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