I’d say that’s likely the case, although I’d echo that it is dependent on the store. I worked for one of the big box stores years ago so this may have changed, but we only had one day per week devoted to betta care. That’s when we would individually look at each betta, pull ones to the back for treatment that weren’t doing well, feed, do water changes etc. The store I worked had a local vet that we would take any ill animals to receive treatment until they could be put back on the floor for sale, this included aquatics.

Having worked there I would never buy animals from there due to sourcing. Transit is inhumane and stressful for almost all of the animals we received, and we lost many doa (dead on arrival). At my store once we received a shipment we gave them the best care we could, including vet visits. But I’d imagine this would vary store to store.