Justice Bucket

I have a Brackish tank set up with monos and would like to add fiddler crabs with a turtle dock for them to get some land time. I will seal up the top because I hear they love climbing out. Will my Mono's attack? or fiddlers snatch them? My monos are pretty fast..

fishpie

I'd skip the crabs the can be violent

MizRamzi

I'm so glad to find others who are keeping brackish. I've got a 20gal setup at the moment. It's housing 3 night gobys, 1 figure8 puffer, 3 celebes rainbows, 3 orange chromides and 1 rhinohorn goby.
The rhinohorn was a *oh he's so cute* buy. But I'm glad I did. What an awesome little (i mean little) fish.
I'm always looking for in put on the best way to monitor water changes. Like how much salt to put in after taking water out? I bought the wrong hydrometer so it only goes as low at 1.012 yet there is another line below that that I'm taking to be a reading of 1.010. So if I keep it below that I should be ok. Right?

Justice Bucket

Brackish water varies I think check this out...
http://en.wikipedia.org/wiki/Brackish

Brackish Water Fish
Brackish fish originate from areas in which freshwater meets saltwater. Fish that live in these areas are able to tolerate a wide range of salinities. Brackish fish do best in water with a salinity of 1.015, or one to two teaspoons of salt per gallon, and a pH of 7.5 or higher.

Hey MizRamzi. Do you have pictures of your brackish tank? And what size is it?

MizRamzi

I'm starting small. But today I'm going to pick up a 45 hex but I think that may be to deep for a brackish. What do you think?

http://badmanstropicalfish.com/brackish/brackish.html

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Justice Bucket

I like it alot. Are you going to put a background? That's a sand substrate right? I have white crushed coral, but thinking of changing to sand...

MizRamzi

It's silica sand. I haven't found a backing I like yet. I put a small power head in today to mimic the river currents, they love it! You should see the puffer. I was calling him Bettle Juice, now I may change it to, Surfin King.
This lil guy is a Rhinohorn Goby. He's one of my favorites.

Attached Images

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sirdarksol

This depends entirely on the species of fish. There are a wide variety of brackish areas in the world, ranging from barely salty to almost marine.
Take monos, for example (presuming you're talking about the silver moony, which is the most commonly kept mono); as juveniles, they thrive in 1.008 SG. However, as the silver moony grows, it travels out of the estuary, heading into the ocean. Eventually, its water should be a full marine.

To answer your original question, it's worth a try. Your monos may decide the fiddler looks like food, but I don't know that they have the tools necessary to break the shell (be sure to offer hiding spots for molting). As long as you keep the crabs well fed, they shouldn't bother the monos much.

Justice Bucket

Thanks for the advice, as a background, I downloaded high quality picx of space photos (i.e. nebulae's etc and blew them up to the size of the tank)
http://leisureguy.files.wordpress.co...rab-nebula.jpg

True about the monos but their juvies now so I have some time...