I am looking to get 2 half shells to provide a hiding place for my shrimps.

I found this on eBay and just wondered if if was something I could easily do myself?

The price of these look very reasonable in my opinion and would save a lot of work as the seller has already sanded and boiled them.

https://rover.ebay.com/rover/0/0/0?mpr ... Fulk%2Fitm%2F232539982821