My Juvenile Sailfin has been with us for about 1 year. This tank is 2 years old now but we have been in the hobby about 15 years now. Every 2-3 weeks his color changes as well as his mood. He stops eating and hides in the rocks. After a week of this his color comes back and he is out and is eating. He is going through this again but this morning he is at the top of the tank and we can see some of his tankmates are picking on him. Has anyone seen this. Like I say it comes and goes for him and no others.