Any idea how long this will take. I am doing it now.Video doesn’t play for me but I for one would be getting it out of my tank until an ID can be made.. if you take a small container and add a couple inches of water into the bottom and then place something like a small egg crate rack into container to set the rock on so it’s at the top of water level whatever is in the rock will most likely come out and make its way into the water underneath.
not much of a artist but maybe this will convey my method