Underwater crab habitat

[Spidyman]

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ok so my bro was nice enough to order this underwater island for crabs. It is 12x10 and it is the largest one they have. It will be placed inside a 40 gallon tank. I have a few questions.
1. First can I mix rcc and fiddlers?
2. How many crabs can I get mixed or unmixed?
3 any one have or hear of the moon crab and what care they need?

[Spidyman]

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[Lady Hobbs]

I enjoyed the video but I know nothing about crabs. I thought they were supposed to be in brackish tanks with sand bottoms tho. Maybe I need to read up on them more, huh? They are neat to watch.

[johndoe222]

Almost all aquarium crabs are brackish. And yes LH it is ideal for them to have a sandy substrate because there legs are designed to walk across sand.

[Spidyman]

Ya I have brackish and a sand bottom

[Rue]

Cool! I've never seen that before.

[Spidyman]

Ya it is new to the market and it allows you to easily keep not only Crabs but amphibian with fish