1. If they can get their claws on the fish, the fish will become lunch. Just a warning.
2. In a word, yes
3. Not that I can think of

I may be wrong on 2 & 3 though. Let Google be your guide!

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Officially fishless until after the move....tune in later for details!

My red claw stays submerged all the time, and I know someone whos had theres for over 6 months and he stays submerged at all times too. Also I have mine with khuli loaches and they sometimes bump into the crab, and he'll pinch them to get away, but he's more grumpy and territorial than aggressive. Honestly I can't think of a fish that wouldn't get along with one because they seem to mind their own buisness. If you're concerned with it being submerged at all times, then you can pick it up and hold it for a few minutes a couple times a week or something. I've taken mine out before.

Also this : Crab Habitats Under Water | The Reptile Enclosure

Good luck, post any other questions and I recommend red claws.

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16g-2 guppies, 1 bolivian ram, 3 neon tetras,2 khulis
55g-1 red tail shark, 1 rubberlip plecos, 2 banjo cats,
2 silver dollars, 6 white clouds,

red claw crabs will survive underwater but generally they do better when have access to land, they tend to become unhealthy if they arnt ;)

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just have a stone sticking out or somthing

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They are very enjoyable little guys, but be warned: they LOVE to climb and will gladly climb out of a tank. I have fished them out of the pump housings on more than one occasion after I just knew I'd made the tank escape proof.

Like another guy said "they try to escape harder than Steve McQueen" LOL.

We have two turtle floats that are anchored to plants and the crabs easily climb up and onto the floats, so they can get out of the water when they want. Lately we've taken to leaving slices of cucumber on the floats, and it is nothing to have three or four eating at the same time.

Watch out for the tiger barbs if you get an especially small crab.

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A little world inside my world, with little people in it.