Brackish water help for crabs - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 10 Old 03-29-2008, 09:55 PM Thread Starter
Brackish water help for crabs

I really wanted a fiddler crab ever since i saw them so i looked up some info before buying them. It said that fiddlers needed a brackish water solution. I have aquarium salt. Can i make a brakish water solution with that? If so, how much salt do i put in the water for 1 cup? The salt is from API. for diesase treatment and stress resducer, it says to use 1 rounded tablespoonful for every 5 gallons.

Also, can i use the calcium carbonate sand for hermit crabs to use as substrate for fiddler crabs?

Sorry for all the questions guys.
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post #2 of 10 Old 03-29-2008, 09:58 PM
Aquarium salt is not for raising salinity levels. That is what the label says; stress reducer, ich medications, etc. You need marine salt for this, such as what you would use for saltwater.
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post #3 of 10 Old 03-29-2008, 11:17 PM Thread Starter
what if i used somehting like instsnt ocean. how much do i use to create a brackish water solution?
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post #4 of 10 Old 03-29-2008, 11:28 PM
There should be instructions on the back of the bucket/bag for the proper addition of salt.

As for the specific gravity, it should be around 1.010-1.020. Some have the SG as low as 1.005 even. However, 1.020 is almost marine, so I would keep it in the low teens (1.009-1.015). A refractometer will help determine this.
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post #5 of 10 Old 03-30-2008, 10:16 AM Thread Starter
ok then, but can i use hermit crab sand?
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post #6 of 10 Old 03-30-2008, 11:15 AM
Do you have a tank just for the fiddler crab? If you use instant ocean it should have the calcium in there, and then why the fiddler molts it should be allowed to eat it's exoskeleton for additional calcium. Plain sand will probably work. Remember to have your "dry area" set up where the crab can't jump out and some good hiding spots for them since they're pretty skittish around people and even worse during molting.
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post #7 of 10 Old 03-30-2008, 03:30 PM Thread Starter
i just bought natural salt mix from oceanic. it doesn't say how to mix salt for brackish water. how do i do it? it says to use the whole pouch for 5 gallons of water. its 1.45 lb.
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post #8 of 10 Old 03-30-2008, 04:05 PM
Well, how big is your tank?
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post #9 of 10 Old 03-30-2008, 09:22 PM Thread Starter
5 gallons. im going to put the crabs in my 10 gallon fish tank when i get my 55 gallon tank.
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post #10 of 10 Old 03-31-2008, 06:26 AM
Hmmm...I don't think the crab needs THAT much, it probably would actually shock him because at most petstores (excluding my local Petsmart, surprisingly) they're dumb and keep them in freshwater. Maybe use a quarter of the pouch and then measure the salinity and just keep adding to where you want it?
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