Is This Appropriate For Fiddler Crabs?

Dave Legacy

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So I've had my 40G Mangrove Swamp tank running for almost 2 months now and my archers are doing pretty well. Currently I only have the 4 Toxotes Jaculatrix measuring in at about 2" each. From the start this tank has been planned as a species only tank so I'm not really interested in other fish... however I'm interested in adding some sorts of crustaceans or other types of inverts.

It seems that I'm pretty limited. Doesn't seem like there are a whole lot of brackish inverts on the market for home aquarium use. So I've been thinking about doing some fiddler crabs but I wanted some opinions before I made the move.

My tank has a SG of 1.006-7, has 10" of water, and has a huge piece of driftwood that extends about 8" above the water line. It's basically a stump with roots that extend off the bottom of it with a large surface area at the top and 1/2 of it wet at all times because water from my HOB filter is running down it leaving the other 1/2 dry.

I have heard that fiddler crabs are great climbers and I was wondering if this large stump would be appropriate for maybe 2 crabs. I'm starting to think that the archers and crabs would pretty much leave each other alone. Maybe the crabs might get pecked at now and then, but they should be strong enough to take care of themselves.

My next project is a fairly large vivarium that will house my 4 archers, a few mudskippers, and crabs either fiddlers or ghost crabs in a Northern Australian Biotope. Once the archers start to show thier size I'm moving them out.

Are the crabs do-able now? Any suggestions for other types of inverts that would work out for this tank? It just feels like it needs more life just not more fish. On a side note I plan to run my SG all the way up to 1.015 SG.

Thanks,
Dave
 
I would just make sure you have some kind of sandy substrate for the fiddlers to burrow down in. My Fiddlers spend most of their time outside of water so I'm not quite sure that would be enough land.

You might also look at Red Crabs which I've heard (and mine do as well) spend much more time in the water and don't seem to like to burrow as much.
 

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