emerald crab question

[TAXMAN]

Why are mine turning white shelled? They always have and then they dissapear. I am assuming that they die off. Water test ok. I have a ca reactor so it shouldnt be ca levels. what do you guys think?

[Jonthefishguy]

Emerald crabs eat algae in which is where they get their green color. If there is not enough algae, they tend to scrape off coraline algae to eat as well. If you do not have any macroalgae in your tank for them to eat, they will loose their color and eventually starve and die. If this is the case, simply add a bit of green algae sheet such as NORI or something for them to eat and stay healthy.

[Obi-Wan the Goby]

Emerald crabs eat algae in which is where they get their green color.

Are we sure about that? I mean, it also seems likely that the greenness was naturally selected to help them hide in algae-covered rocks.

Just curious, tks.

[justahobby]

I discovered my emerald green dead and white shelled. He stayed hidden so I assumed he turned white after death. Glad you posted.