| I used to keep em, fun little guys... and yes it's way annoying to read the constant contradictions. The reality is a naturaly brackish environment will transition from near fresh to near salt throughout the seasons so brackish fish tend to tolerate odd environments. If you want them to thrive... stay brackish!
As far as how many you can keep it depends on tank size, variety of hiding places and unfortunately demeanor of fish. I've had luck keeping 8 in a tank with each other and I've had instances where I could only keep two cause they were just way too into picking on each other. Just like any semi aggressive fish its easier to add them all at once rather than one at a time as well. population density is pretty much a crapshoot from what I've seen.
All in all though they're one of the coolest fish I've ever had, lots of personality!
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~J
because it's all about the plankton | 
