I could put them in my sump but do they need light? My sump room light is always off.

i have a home for homeless crabs:sad:

Wayne it would make me really happy if it's a predator tank. Revenge is bitter sweet.:twised:

CAUTION
 

It is never a good idea to put a snail or a hermit in your sump. They may eventually make there way to the inlet of your pump and the shell can damage the impeller in your pump and possibly cause other problems as well.
Offer them to the reefer or take them back to the LFS. They are reef critters too.

I installed a 90º elbow pointed down which is very close to the glass. I don't think they can get in. The elbow works great to increase the minimum water level in a sump.

not related to your hermit issue...but your sump should have a light over it, when ever the lights on the main tank are off

My understanding is that this rule only applies to a sump with a refugium containing chaeto, etc. I don't completely understand, but something to do with the oxygen release??

Bignose only has rock in his sump so it should not be an issue.

SNAILS FTW. :lol: ya i had hermits in my first set up 5 yrs ago lol and never again lol, and never want any crabs either lol shrimp pretty much grabs all the food that end up in the sand, although my snails do keep on disappearing :sad:. found 2 in the sump but not sure where the rest went :lol: but the magfloat and scrapper does wonders on the glass lol

I like to get rid of my hermits too, the blue legs kills my cerith snails.
but I worried about one thing, hermit crabs can quickly eat dead fish/coral/snail, without them how can I do that?

+1.

I can add... don't kill anything! Ha ha.

I agree with your statement though... and feel that they are definitely useful for clean-up.

I just say to remove the "problem" crabs. Not all crabs act the same IMO. Some are coral "sitters" others are not.