He is about 4 years old. We have been through 5 sucessful moults. He has gotten really aggressive though this past month or so and I am wondering if maybe he is mature now. Who knows? I am told he would probably kill a female even if I could find one so he is out of luck, poor guy. I like him, he is pretty interesting to watch. He will only eat black fish and lets the ghost shrimp walk all over him. LOL That is how I ended up with 200 guppies, my friend brought me some to feed him and he didn't like them so they moved into my 20 gallon.
4 years, and he doesn't like eating guppies! He has some catching up to do then! Houdini LOVED to eat prawns, and any other small fish. Hope you've got him in a deep, and secure tank! Else he'll go walkabout's like mine