How many hermit crabs?
 

How many hermit crabs should I put in my tank? I just added 250 small-med and am wondering if that was too many.

Wow that is a lot of hermit crabs! I guess it all depends on how much alage you have. I have heard 1 per gallon, but that seem like a good start.
It will be the thunder dome when they all start needing new shells [emoji23]

What type did you get?

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I usually go with about 10 to 20 in a hundred gallon tank. But if you have too many, just trade them back to your lfs for, oh, fish food or whatever.

4 Scarlet hermit crabs.
keep track of your friends.

I'll only have the scarlet reef hermits in my systems. I currently have 1. It's someplace around 25 years old I think. At least I got it before I got married in 2001. The others all tend to be a little too opportunistic when it comes to feeding time.