Regardless of how healthy the fish look, I would never buy anything from P@H (assuming that's who we're discussing). Not a sausage. The staff are often undereducated in species-specific animal care, and even those who do have a level of knowledge are under instruction to give out bad/advice in order to maximise potential profit (I have been advised that a 17l tank was 'perfect' for three goldfish, that I can put fish in after a week etc etc). I know a girl who used to work at P@H who left because the management wouldn't let her give out appropriate advise (she was big on fish keeping). They told her to only tell people what she was told to tell them.
But that's not even the key reason I wont buy anything from there. P@H don't sit well with my personal ethics and morals. They get their animals from intensive breeding farms, where rodents, rabbits and reptiles are mass-bred in tubs. Mothers are bred repeatedly and then culled when they are no longer useful. The health and/or genetic history of the animals is unknown because they are literally just sticking males and females together with no care for what could come out of it. Their animals (particularly their rodents) often have serious genetic illnesses that show themselves before a year of age.
Sorry for going on - it's something I feel really strongly about. If anybody is interested, I can link to a thread on another forum which includes pictures from a visit to a rodent farm.
Relating this back to fishkeeping, I'm starting to wonder where I'm going to get my fish from, I assume there are ethical breeders out there somewhere.