can cichlids and fiddler crabs co-exist?

First, fillders are brackish. Second they will need land(or some way to get to the surface for air, Irrelevant to your question, but important if you get one for another tank) And third, even if you get them for freshwater in the hopes that anyone saying they are brackish is wrong, they will be food in short time.
 
No need to appologize, we all need to start somewhere. By asking first, you show you at least care. Brackish is between salt and freshwater. Picture(for an analogy) the area of a river where it empties to the ocean. There is some mixing of the saltwater and freshwater, so it is neither one nor the other.
So you know, your oscar will get too big for that tank as will the texas, the GT should be ok. Problem is, both will grow to 12" which is the width of your tank, they will have issues trying to turn arround.
 
thanks

i'm actually a lobsterman in maine, and we bait near the fore river, and you can tell when a lobster got to close. so i now really understand brackish. if set up properly could you keep fiddler crabs in a 10gallon? and as a side note, i have realized the pet store info was bogus, and i'm currently looking into a 120 gallon, for cichlids.
 
Good call on the larger tank, the sooner the better to prevent stunting thier growth. I think 10 gallons will suffice for a fiddler, possibly a few if they can co-exist peacfully, but i'm not an expert on those guys. Remember to have some way for them to get up for air, like keeping the water low, or providing a platform for them to crawl up. Just make sure it can't get out!
 
You could set up the tank much like you would a turtle or frog tank. Put a piece of glass or plastic in the middle of the 10g seal it in place full one side with water and the other side with sand or pea gravel and a couple plants. Get a in-tank filter.
 
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