What place is most preferred to get fish?

Jan 21, 2017
I usually get fish at Petco and Petsmart. And I am wondering... Is it a more likely chance to have a healthy fish at Petco or Petsmart? Because I see that Petco has a larger selection of fish. But at Petsmart I see that the tanks are larger and the fish there because the way they grow in the tanks they look healthy. What do you guys consider?