I'm new to the discus world. I own 4 blue cobalt discus. They were originally raised in 8.6 pH water. I decided to give them a shot.
My question however; they turn a very dark colour (which I assume is stress) but when I walk up to the tank or do any maintenance they seem to return back to their original state. All of them are eating, etc.
Is there any explanation for this? Its almost like they need attention in order to be happy. I really have no idea.
Thanks in advance.