Same here, although the place that I've been going to doesn't know my name. He knows my face. He'll tell me how long he's had fish. He'll feed them for me. One time recently, the fish weren't eating. He told me to hold off, but kept two for me. I went back a week later and bought. He also posts his purchases on Facebook, so I could look there - although I trust him.
It can be slow to go in there, but that's only because he spends time with each customer. He doesn't rush anyone.