Agree with moe^^^my juvie is also dark, and not stressed, and it also in a "dark" setup. In a month or two it'll be moved to lighter tank, so it'll be interested to see how it's color changes.
Thanks! I need the flow to stop the Arowanas from fighting as much. The current distracts them.
As for the darker color, it could possibly be the tanning lamp or stress for the fighting.
Jardinis get dark not due to stress but naturally they're a fairly dark aro, you're setup is all black substrate and background. You should expect them to be black and get some nice reds as they grow.
Just for my interest, - and I'm is not being critical of your comm challenge - at which point will you split them up, and how many would you hope to keep in the tank.
lovely comm im glad with work out for you. Just watch out once they hit 10" plus, that is the most dangerous size. 10-12"