But if it is a land crab,I don't see how it's going to survive long term submersed. Sandsifting gobies generally do not do well long term either, unless the tank is huge. And, they do not benefit your tank..on the contrary, they eat and remove beneficial organisms from your sand. You want creatures that shift the sand, not sift the sand. The same goes for sandsifting starfish. Another creature I will not sell.
The Sally lightfoot crab is a land based crab, but actually spends most if not all if its life completely submersed.
I had a Diamond Watchman Goby for almost 2 years before he jumped out of the tank, and he did great, and kept the sand looking new all the time. I also had a Sand sifting starfish which was a cool little guy, but can't say he did great at keeping all the sand turned over, He unfortunitly didn't make it threw my move.
Weather I purchased them for my tank, or someone else does, or no one does. They are already harvested, and if they are going to die, they will die anyway no matter who's tank they are in. So by not buying them at the LFS that doesn't save em.
People also say PBT's shouldn't be harvested yet i have one that's doing great in my tank, had thousands and thousands of others do as well.
None the less, Thank you very much for finding this information out. I looked them up, and they are really neat creatures, even if they don't make it in the aquarium, I'd love to go to the beach in Aussi some day and see em on vacation...
-TheChad