i don't think thats a good idea...arn't they slightly brackish?? (check here http://aqualandpetsplus.com/Oddball, Stonefish.htm) btw, that tank is just about filled with the sun catfish and plecos...
stocklist:
-5 silver dollars
-5 green severums
-delhezi bichir
-2 plecos
-sun catfish.
-banded leprinous
-any other large fish please reccomend