Hi Christopher,
Welcome back to the hobby.

I've got zero experience with nano-reefs. I've done 30 to 135 gallons but nothing smaller...
However I thought I'd let you know of a website with great information that I often use.
It's called 'WetWebMedia' and has sections devoted to nano reefs (look under "
Small Marine Tanks in the Marine Set up section") and it has a fair bit of info on hermit crabs (look under
False Crabs in the Higher Invertebrate Life section)
A number of articles are there, and much of their information is compiled from replies to questions that are mailed in.
Anyway, hope this helps get you started on the journey! and Happy New Year!
John
PS - I just picked up a Walkera CB100 to try my hand at RC helicopters. Enjoying it so far.