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Jim, are you going to take into account that most brackish water fish can be kept in fresh, especially if slowly adjusted to it? The pet store I used to work at had only fresh water tanks but kept several fish considered brackish or even salt water.
Also, I once read about a guy that slowly raised the salinity in a freshwater tank and slowly lowered it in a salt water tank, and after 10 years was keeping them all in the same tank- fish that would have been thought impossible to do so with due to salinity preferences.
Finally, if the freshwater Serenescreen tank is going to be similar in size to the salt one (200 gal I think it was?), that's large enough in reality to have a large arowana or two. I'm hoping you won't reject this as a possibility, given that they won't eat anything?
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