South American Puffer Not Eating Well

[anustreasure]

Hi all. I have a group of 6 juvenile (less than 1 inch big) SAPs in a species-only planted 75 gallon tank, with 2 75 gallon filters running. They will be upgraded when they get a bit bigger. All water parameters and temperature are great, and most of the fish are as well. I've had these little guys for almost 3 weeks now. Over the last 2-3 days, 1 of them is not eating nearly as much as his friends. He barely eats at all. They were purchased as a bonded group, and none the other fish pick on him. I've observed them non-stop with a camera set up and no one ever bothers him, he just seems like a loner all of a sudden. Everyone else is eating just fine, but they seem to eat everything before he gets to any. He seems intimidated all of a sudden, and only eats if all the other fish are on the other end of the tank. He isn't displaying any symptoms of being sick, he acts totally fine except when it comes to eating.

Should I keep him in the same tank with them and hope he starts eating regularly again, or should I put him in a different tank?

Thanks for any help!

[Pufferpunk]

What do his teeth look like? They are #1 for needing constant dentistry in the puffer world.

[anustreasure]

What do his teeth look like? They are #1 for needing constant dentistry in the puffer world.

Forgot to mention that I checked that, oops. His teeth look great.

[lobowind]

I have one that tends to go off by himself more often than the others. On the flip side, he is the one that is the most interactive with me.