There's no petsmart around here, but we do have the equivalent with petco, and they get tsn, and limas alot, but never rtc. The most recent tsn that I have is now 5". It was in their store for 6 months, and it only grew from 1.5" to 3" in a 6 month time frame. They were feeding him flakes like all their fish! I also got my channel cats there. They were in the store for 4 months at 3" with fin and tail rot that was never treated. I made it a point to tell them every time that's what they had, but they said no their fine, that's what they look like. I'm like how many fish do you see swimming around with no fins, no tail, and no whiskers? He's like trust me that's what they look like and they'll never get over 6" in a ten gallon. I got both, and it took 3 months for the fins to grow out completely, and now the biggest is 14". I've had them about 8 months now. I can't stand that store, but believe it or not it's the best pet store in town. The other two are locally owned, and the owners are more clueless than petco ever thought about being. The one owner does water changes once per month, and her tanks smell and look nasty as hell. The other guy only gets small ornamental fish, which is cool, but not for someone like me who loves large catfish lol. He'll order rtcs for me specifically, but he says I am in the only person in the state that he trusts to raise one.