Fiddler crab in non-brackish water
I didn't research before buying a fiddler crab. I asked the employee if there were any special care requirements, besides the ability to climb out of the water, she said "no"...
Is it possible to increase the salinity to survivable levels along with the following types of fish: featherfin, horsehead, and pleco catfish, silver dollar, neon tetra,minnow, and clam?
Am I doomed to take it back?
I've known people who have kept them in fresh water, but I'm not sure.
-waits for someone to chime in-
Your best bet, would be to return it or set up a small brackish tank for the crab.
Not keeping a brackish crab in brackish, will shorten its life & make it valnrable to health problems.
And, is it possible to keep the other fish with an "in-between" salinity?
Its hard to say how much fresh water will shorten its life. Not keeping them in the proper environment makes it very disease prone. He may be fine for a while, or only live a week.
There are other low end brackish fish, the trouble is crabs require land space to survive, best not kept with fish.
Take it back, or setup a new tank.
I'm going to chime in on the freshwater side of the debate... probably jumping into a firestorm by doing so, but I have a happy, healthy, active fiddler in a freshwater setup. I use freshwater aquarium salt and give him a varied diet to ensure he gets a wide range of nutrients.
Every argument against this only goes as far as to say "true brackish water contains trace elements that a crab needs that aren't found in freshwater or aquarium salt."
Nobody ever says specifically what these trace elements are or why, exactly, they're vital to a fiddler crab's health. If anybody would provide a specific, scientific explanation, I would gladly change my position.
But for now, my firsthand experience is that with a little added attention and care a fiddler crab can thrive in freshwater.
Here's an article on choosing (mostly freshwater) tank mates for you fiddler crab if you're interested...
Best Fiddler Crab Tank Mates: What Fish Can Live with My Fiddler Crab? - Associated Content
I've never heard of an argument with brackish animals and aquarium salt. Aquarium salt does not change salinity. Aquarium salt just sucks in general.
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