Scarlet Hermit crab..


New member
Hello reefers,

I am concerned about my Scarlet hermit crab , It keeps on staying on the Green star polyp, it did move little but it keeps on remaining its spot.
Before I placed the GSP, hermit did move around the tank. Is this normal for Scarlet Hermit to remain 1 spot for 2 or 3 days?? Is this the way hermit behave?

Is it stuck in its shell? i dont have extra empty shell, he came with the live rock. Please help by replying this post..

Thanks in advance..

fish are life

New member
i have been hearing about a couple that are having troubles with their crabs eating/chilling on their star polyps. i dont know y though, move the GSP and place the crab away from it and see what happens then


New member
i did what you suggested, the hermit still came back to his home, i looked at gsp and no damage from eating. its just chilling on it.. but, am concerned about his eating, dont want starve himself. i wonder if shell is too small to roam free? instead it got stuck and stayed same spots for a long time. Is it depressing? I read they prefer to be in group , does him being only hermit affect his behavior? I am going to get more today...


New member
it's likely he's just cleaning up the crud that grows between the polyps. i use bluelegs by the hundreds with all types of coral for clean up and there's been no problems. bluelegs are found together in nature, scarletts are loners on the reef.


Staff member
RC Mod
They are prone to sit a bit, even a whole day or so. But this may also indicate he's getting pretty desperate for a new shell. What he'll like best is a fighting conch shell, preferably one with coralline on it. You can get shells from your lfs, and even if they charge for them it wouldn't be much. Leave a handful lying on the sand and let your hermits choose. My largest was in a piddling little shell, about 3/4 inch wide. When I brought in new shells, there was one the store had tossed in that was two inches wide, which I thought way too large. He ignored all others, was inside that one within a minute of its hitting the sand, and now he lords it over the tank: when I realized the size of his claws I knew he'd been one miserable little crab before he got his new shell.


New member
Update... I brought a new family for the hermit :) 15 scarlets from a friend. I will go to the LFS to get empty shells for 16 hermits. It's cool watching them eat their food and roam around.
16 hermits and 3 Turbo/Astrea Snail.
any other crew should i add? please suggest!!
It is for 29 gallon reef tank.

I plan to buy diamond goby for the sand cleaning. Will my blue with yellow fin damsel kill if I put the goby in 29g?