My big Sailfin does that all the time. It can be stress related, or just mood related. Right now he's sitting on a log in the tank beside me, and has his normal dark colour.
But if I turn around and stare at him he will fade to the mottled colour in about 30secs. Maybe he's just bashfull? Or maybe he's mad about 2 tank moves this week and spending 2 days in a 20 gal :swear: (Replacing carpet)
If he's eating and feeding normally, then it's just a bad mood. Lights switching on, people moving around etc.
Ian
But if I turn around and stare at him he will fade to the mottled colour in about 30secs. Maybe he's just bashfull? Or maybe he's mad about 2 tank moves this week and spending 2 days in a 20 gal :swear: (Replacing carpet)
If he's eating and feeding normally, then it's just a bad mood. Lights switching on, people moving around etc.
Ian