It sounds like your fish is just reaching sexual maturity, unless by "orange" you mean that you're seeing blood tinging.
The orangish coloration is common in larger specimens, particularly the Russeli which is often sold as a volitans.
Thanks for the info, I was afraid it had something to do with the goldfish I feed it but seriously, what is the difference between a Russeli and a Volitan?
It's not good to feed goldfish. It's actually really bad. It is fun to watch, but unhealthy for the fish. goldfish have very little nutritional value. They are mostly fat. It's like eating a tripple cheese burger from wendy's every meal . Train him to eat krill and he will be happier.
I feed my lion feeders, but I don't think they are goldfish. They are FW fish, however. They don't look at all like those you'd typically think of a gold fish looking like...
Those just as bad or somewhat better? They certainly don't appear as "FAT" as goldfish.
Freshwater feeders lack nutritional value. They are high in fat, can introduce pathogens to your tank, and are just plain dirty and nasty. They will eventually cause a fatty buildup on the liver and lead to a premature death. Feed frozen. Bo
My old Volitans that was short-lived due to me feeding goldfish feeders. I did not know what I was doing a while ago and only wish I had the chance to feed frozen to him now. I miss him.