I have kept these fish for a long time.
have to prefer them to the argents although I rate them both highly.
They do best in large volumes of water.
Full fresh or full fresh are fine but really they do best in brackish.
Brackish tanks take a good 6 weeks or so normally to cycle/mature
not something to be rushed.
not quite sure what the problem is that you guys are having but they
definitely don't like nitrite.
They also need lots of food when little
gotta run now but will re-read thread and see if I can't give ya a heads up
on them.
Been catching mono's and scats for my tanks for ages.
Still some of me favourite fish too
Brackish setups Rock da Kazbar!