Hi! Welcome to HCA!
I know you worked really hard on this but there are some areas of concern:
The colored sand is no good. If it is calcium sand your crabs can become trapped or their shells impacted and die. Substrate needs to be a minimum of 3X as deep as your largest crab, ideally half as deep as your tank. 5:1 ratio of playsand to coconut fiber is HCA recommended.
Please remove all painted shells and offer natural shells in sizes and shapes they need. I am going to link the shell guide for you as well as our care guides.
How many crabs are in the tank? It looks like a 10 gallon, yes? If you have more than 2-3 tiny/small crabs, I urge you to consider upgrading to a larger tank to avoid molt attacks.
Here is the link to the care guide
http://www.hermitcrabassociation.com/ph ... hp?t=94257
Don't feel badly; almost all of us started out with less than ideal conditions. I myself had green sand at one time. It was playsand and the only bag Wal*Mart had and it was green! As soon as I could go to Lowe's and get a 50lb bag of playsand, I did. They are less than $5 usually.
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