I got a new delta boy last night. I'm eagerly waiting for him to make a bubble next because I want to see what they look like. Maybe he's just shy. LOL

Not always. I have on occasion had males that won't build a nest until the female is right in the tank with him. You could try taping a small mirror on the side of the tank so he can see himself. He will flare at himself thinking he is real macho and build a nest.

I'm sure it's a bit premature since he's a new fishy, but I set a female in her little tank in the aquarium. she's interested in him- but he's not doing anything. no flaring, no nothing. he's from Petco, so he's probably recovering. he's got lots of swimming room in a nice heated 10 gal.

Are all his fins grown out? You're sure it's a male? He may be to young although I have had males flare as early as three months.

he has long fins. he will extend them but not his gills.

here's Sami- my son named him.

Yes look like a male Cambodian. Is he eating good? Does he seem to be healthy? Some times it just takes some longer to mature.

what should I feed him? He's not into the flakes.

they love blood worms

Feed him Betta pellets you can get at your LFS and the bloodworms.

We got blood worms. And I'm going to pick up some pellets too. The flakes are quite messy.

Yes I've never used flakes for my Bettas.