Freshwater/Brackisk Aquarium - The Planted Tank Forum
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post #1 of 8 (permalink) Old 06-12-2013, 03:38 PM Thread Starter
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Freshwater/Brackisk Aquarium

Hey guys and gals, I've got a question but I think I already know the answer. Has anyone ever combined a freshwater planted aquarium with a brackish one? I'm talking to the point where one doesn't effect the other but it allows fauna to go from one to the other. The reason I'm asking is due to the fact that amano shrimp can only successfully spawn in brackish environments. Plus I think it would be pretty cool to be able to have those two environments in one aquarium. Any ideas, or should I stop wondering because it can't be done. Thanks.
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post #2 of 8 (permalink) Old 06-12-2013, 03:47 PM Thread Starter
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Oh, and if it would be possible at all what sized tank would be needed. Or would two different tanks need to be connected somehow?

I know that in the environment freshwater streams and rivers are connected to estuaries (brackish water) before going on into the ocean but I think it would be a major project due to the fact that freshwater turns into brackish water over a distance and the brackish water doesn't flow back into freshwater but hey, anything is possible, right?
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post #3 of 8 (permalink) Old 06-12-2013, 03:52 PM
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I say have 2 separate tanks, 1 brackish 1 freshwater. When the amano shrimp spawn use a larval trap to catch the babies and then use the brackish as a rearing tank.

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post #4 of 8 (permalink) Old 06-12-2013, 04:16 PM
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The solution of brackish water will taint the fresh supply...

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post #5 of 8 (permalink) Old 06-12-2013, 07:49 PM Thread Starter
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I appreciate the responses. I had a feeling that it would harm the freshwater supply and I was, in the end, planning on doing two Sep tanks bug was just wondering if something like that have ever been attempted. Thanks guys.
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post #6 of 8 (permalink) Old 06-12-2013, 07:55 PM
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+1...laws of diffusion, the salt will travel from an area of high concentration to low concentration, so you're better off with 2 separate tanks like you planned.

Originally Posted by steven p View Post
The solution of brackish water will taint the fresh supply...
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post #7 of 8 (permalink) Old 06-13-2013, 02:46 AM
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In nature the fresh water is higher up than the brackish water, and the fresh water has a constant supply (rain, melting snow) that keeps pushing the brackish water out to sea.

I suppose you might try this with an upper tank (fresh water) that drains down to a brackish water tank, but you could not then pump the brackish water back up into the fresh water tank. You would need a constant source of fresh water, and a disposal system for the brackish.
Certainly not impossible, especially since you would probably be interested in a slow flow going down stream so that the animals in the brackish tank could 'swim upstream' if they wanted to.
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post #8 of 8 (permalink) Old 06-13-2013, 08:31 AM
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You may wish to consult the book Dynamic Aquaria by Adey and Loveland. See if your local library can get it for you, rather than buy it, since the book is fairly expensive.

Chapter 23 is devoted to setting up a model ecosystem of Chesapeake Bay. In this system one end is FW and it progresses through various sections when the other sections having more and more salt in them, until the final section is Full SW.

To keep the salinity correct in each section, computer controlled gates were used to allow water flow between adjacent sections. If the salinity was too low, the gate to the more salty water was opened. If too high the gate to the less salty water was opened. The full strength SW section used an RO unit to remove pure FW from the SW. This maintained the salinity. The FW went back to the other end of the system.

Obviously this was a huge project, and beyond your typical home aquarium, but you might get some ideas of what could be done, if you want to get involved in all the equipment to control it. A 2 or 3 tank version would be a great project for the right person.
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