Hi there,

I have a female fiddler crab. I've just moved her out of my 25 gal fish tank where I had lots of ways for her to get out to the air, bot not out of the tank, but my clown loach was getting a bit mouthy so I got a 10 gal tank for her to be safe. I have a couple of guppies in there now. I've heard that I should use marine salt and not regular aquarium salt. Is that really necessary? Will the guppies be okay with that? If not, I'll take them out. I'm looking for some other crustaceans to share the tank with her and thought about RCC or bamboo shrimp. Any thoughts?