So small, I got a senegal from petsmart at that size, well mine was maybe a bit longer, but much skinnier, goodluck with him!
Update....if anyone wants to know....he's strong and healthy as ever. I was just looking at the pic I posted and I swear he seems like he's grown a half an inch or more. Then I thought...nah...he couldn't have grown that much, could he? But he is definitely bigger. I just haven't noticed on a daily basis. He's a very good eater so he's got that going for him. I sometimes put small pieces of nightcrawlers in there. I was very surprised when he acted very aggressive and bit a piece of worm that was larger than his head was...then he managed to eat the entire thing quickly. Now he eats even bigger pieces when I feed them to him and it's always amusing to see him get so worked up finding and attacking the food. It's like he thinks he's a shark or something. Hilarious. I hope he keeps those red eyes as he gets larger. One thing I noticed once I got him home....it looked like he was missing one of or most of one of his fins on his side near his head. I know that another fish in my tank didn't hurt him because I saw it when I put him in there but he was so tiny that it was kind of hard to say if he had been attacked at the lfs or if it just was a deformity. So I'm wondering if it will grow back or be a big deal at all. It doesn't seem to affect him at all.
It will grow back, just keep the water clean
Can't be sure, mine is missing two fins and I've had it 1.5 years.. it was a genetic deformation on mine.