Hi, Long time hermit crab owner and moderator on hermit crab paradise and crabstreet journal here! I have owned hermit crabs for about 7 years now. I am forever giving out caresheets to petstores in adelaide, many welcome my suggestions many dislike my input. I have written a care book and devised a list of hermit crab food with other hermit crab owners in the US. I only use organically friendly foods and make all of my hermit crab food from scratch. (I am at the stage where I am trying to sell it) First i need the food lab analysed. ($1000 a sample)
from the looks of your tank it seems to only be a 20 gal at the most. The measurements we use for out tanks are the same as the US for volume! A 4ft is approx 50 gal. I have 1 six ft, a four ft and 2 two ft tanks for my crabs. (I have 25 crabs) and they keep you on your feet!
They require alot more care than most people realise! I started with two and fell in love with them! I like to think i have a passion for them! I spend about 2 hours a day tending to their needs and even more on weekends when i am on the look out for more ornaments and ideas to keep them interested and well exercised. This even involves their 3hr playtime in an old shell pool, which is covered with a layer of sand and decorated with driftwood, coral lots of seashells (other than the ones that go in the tank, and my homemade gym course, and their hermit crab spa. (a large reptile water bowl filled with instant ocean water and a fish tank pump!
I truly spoil them. But thats my obsession!
If you need help give us a yell!
Cheers
Sam