Blue knuckle hermit crabs

[Kehaulani]

Does anyone have these in their tank? I like how they look but was wondering what they eat. I have some green hair algae on some rocks and my blue legged hermits love it so was wondering are the blue knuckle hermits the same? What is different about them?
Thanks in advance
K

 

[CastAway]

I've had one for several months. I love it. It seems to just graze. At night when I feed my ricordea and sun polyps, it robs them blind though. I have to physically move it to the opposite end of my tank. So it is definitely a carnivore, if not an omnivore.

 

[Kehaulani]

Gotacha.

 

[Pete polyp]

In loved the one I had, but he was lost in a Bayer insecticide accident. Very good addition to your tank for sure.