About the coloration,I saw a HUGE gibbiceps at our LFS,that I think has been in an allmost unlit tank for all his life.
His usual "pantherlike-spots" had allmost completely diappeared.
This fish was black as night and my wife mistaked it to be a pseuda!
When I went to get my new gar,which was in the same tank, the guys at the LFS had to chase my new fish a bit,and then I noticed the gibbi.
He suddenly had a lightgrey banded pattern over his body and his head turned into different shades of grey!!!(Kinda like the pattern you find on hypostomus sp.)
I WAS AMAZED about his enormous change in appearance and at the fishes ability to adapt to his suroundings.
Do yours change colour?