do bumblebee gobys and glass catfish deal ok with brackish water?
Glass catfish certainly do not want brackish water, and their tolerance of brackish water is not likely to be very high. They need the same conditions as gouramis, barbs, and other Asian freshwater fish. Bumblebee gobies are bit more tricky. In the wild at least some species are primarily freshwater fish that occur only sometimes in brackish water. While all BBGs do well in brackish water, what isn't clear is if brackish water is essential. Most of the time, BBGs die because they don't get enough to eat, and expert fishkeepers have kept and bred them in freshwater alongside even things like neons.
i have gobys in my livebearer fry tank that contains salt and glass catfish in my livebearer tank that also contains salt. so far everyone is doing well but i thought i would ask and make sure
BBGs and livebearers will both be fine in slightly brackish water, though they will eat livebearer fry. What are the livebearers? Guppies, platies, and swordtails do not need salt. For mollies, it is more debateable. In pristine freshwater they do not need salt, but in the average aquarium with more than 20 ppm nitrate, the addition of salt seems to help. Regardless, all mollies do very well in brackish or salt water.
Cheers, Neale