Brackish Monster Tank

[spitz006]

I impulse bought a polypterus endlicheri (Saddled Bichir) and a datnioid polota. (supposedly the smallest datnoid).
I've done a lot of research on both species and they both are commonly found in brackish and freshwater environments. They're both about 3 inches long right now. Eventually I'll have them in a 125 gallon(473L) at a minimum, most likely something larger like a 180 gallon(681L). Thinking in the long-term, what tankmates should I be considering?

I love the look of the Knight Goby (stigmatogobius sadanundio) and the Figure-8 Puffer (Tetraodon biocellatus). At least for a year or so until they become snack size.

I don't want to do monos, scats, or any other fish that will eventually need full saltwater.

I might consider archers. Any other options?

 

[Cicinho]

How about the larger gobies such as a marbled goby oxyeleotris marmorata or a crazy fish butis butis? or maybe a moray eel gymnothorax "tile" or toadfish allenbatrachus grunniens? Or maybe another datnoid like datnioides campbelli which is only aggressive to its own kind or maybe even the targetfish terapon jarbua? Most of these fish grow over 30cm long except the butis butis which only grows to about 20cm. Still many other options but its all up to you.

 

[brackishdude]

good suggestions all. But 180 may still be too small for these mosnters. . .