Fading lines/bars

[LisaLove14]

just curious.. as I have said before I am new to discus keeping.. Why is it that sometimes the lines/bars on a few of my discus's fade and then get darker at different times.. Do they come and go with stress or as their mood change?

[Proteus]

They are commonly known as stress or agro bars...

when they are stressed, or maybe feeling a little defensive, say against another fish, they will show there bars as a mark of dominance...

hope that makes sense.

[LisaLove14]

I see thanks for the responce.. I thought it might be for that reason but wasn't completely sure..