Can you keep freshwater fish in Brackish tank??

What do you mean by furnishings? An airator isn't needed. Most HOB filters will make enough surface agitation to create good air exchange. Any plants will also help. Plants will also help create hiding spots for fry.
 
Java fern, java moss, hornwort and water sprite all work in brackish water. As for decorations, any will work. Rocks are nice (any type will do) or else what ever fancy ceramic decoration you like will do.
 
Keep in mind, most of those plants won't make it past 1.005. How big is your tank? What BW fish do you want?
 
i might keep my tank fw my tank is 20 gallon long i thinking about guppies mollies and swordtail. right now i have 2 zebra danios and an albaino cory in my tank
 
I'll add the caution note that shifting an operating tank from FW to BW should not be increased by much more than 0.002 per week. At some point, the bacteria shift to different species, and that change-over is poorly defined to date. If done slowly, you are unlikely to ever see detectable ammonia or nitrites.
 
cory cats in brackish

I turned my tank into a brackish tank about 40 days ago. It has been going great and i had turned it from a fresh water tank to a brackish tank. there are some fish that are living in there that shouldn't be i have a blue tetra , and TWO GREEN CORY's that are totally living fine and show no signs of dying anytime soon. and my tank is at 5 tbs/ gallon of salt, and it is a 55 gallon tank. So it is possible that if you acclimate slowly to the brackish that some of the fish will survive, it all depends on each individual fish and how it copes with the changing situation. You would be able to live in a smog filled city wouldn't you?
 
It seems rather silly to take the chance that "some fish will survive" if you go slowly enough. Why try to keep fish that aren't brackish in brackkish conditions. If it doesn''t help them live longer better lives then it seems silly to do. Keep 2 tanks if you like brackish and freshwater species. Cory cats can live for 5 or more years if properly cared for but I doubt they will in a highly brackish setup.
 
Re: cory cats in brackish

Originally posted by jtdecoff
I turned my tank into a brackish tank about 40 days ago. It has been going great and i had turned it from a fresh water tank to a brackish tank. there are some fish that are living in there that shouldn't be i have a blue tetra , and TWO GREEN CORY's that are totally living fine and show no signs of dying anytime soon. and my tank is at 5 tbs/ gallon of salt, and it is a 55 gallon tank. So it is possible that if you acclimate slowly to the brackish that some of the fish will survive, it all depends on each individual fish and how it copes with the changing situation. You would be able to live in a smog filled city wouldn't you?
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Depending on whether you're using the right type of salt, cories could tolerate aquarium salt. However there is no way for even short periods of time they'd be able to tolerate marine salt. The salt burns the skin of fish whom aren't able to tolerate the salt and slowly kills them over time. Do YOU want to do that to your cories?
 
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