The fish in the shop tank won't look like the pictures in books or online. Most pictures show adult males displaying to each other and that is when they show their best colour. The rest of the time they will be much less colourful.
If you look on YouTube, you might be able to see what they really look like when not showing off. They are still nice but not as nice as the pictures.
It's a bit like Iriatherina werneri. I saw a picture of one on the cover of a TFH magazine back in the late 80s. The fish was magnificent and filled the entire cover. One of my coworkers said Vebas had them and he took me out there to see them. They were tiny, about 1 inch long and grey. That was it. I was expecting something a bit bigger. The fish on the cover was an adult male in full display but the ones in the shop were young adults in normal colour.