Heart Urchin suitable for home aquaria?

[Breadbox]

So recently my LFS have these guys in stock, their looks tickles me immensely so I must ask if any got any care experience regarding these little creatures?
Are they like conches or nassarius? Or are they like a sand sifting star where they'll deplete your sand bed and starve?

For whatever reason the lfs calls them 'Sea mouse' but I digress, Ii have fluval flex 32.5 that I kinda overfeed with around 2/3 inche of sand bed, the area isn't that large since it has alot of rocks. Also, do they bury themselves? What about targetted feeding? If anyone knows, let me know.

 

[SlugSnorter]

their fine, they eat poop, scraps, etc

If i remember correctly they do not eat algae and such as much as other urchins and scavenge on the sand bed