Got this on Saturday, the store said they were having salinity issues in the tank and all the nems looked pretty unhappy, but it was on sale, less than 50% original cost and it was the happiest looking one (nice colours, open, not shriveled). I brought it home and everything I had read said to place it either in a rock crevice or on the sand bed. I put it on the sand bed and it settled in. Then it just kept on settling. This morning it was basically fully covered. I dug it up and put it in a jar with a piece of flat Aquaweld for 15 minutes, it seemed to stick, so I put it back in the tank. Darned if the thing didn't crawl off, so I put a piece of rubble rock beside it and under it a little. Nope it crawled back into the sand. Now it looks like this. Does it look ok? The sand is too deep for its foot to anchor on the glass here. You can see the Aquaweld and rubble in the second pic. Do I try to place it again or just leave it? Is it normal for them to submerge under the sand?