There is a LFS in my city that usually carries a wide selection of plants and livestock, and they are usually good quality. The advice is sometimes suspect as one day he tried telling me that I needed to get rid of the pond snails in my tanks because they were going to eat all my plants! I politely declined his solutions.
When I've been in previously to buy plants the tanks are labelled with such things as, 'needs plant substrate,' 'high light needed,' 'CO2 injected tanks only.' Which can be good for newbies and such who don't know any better, except that most of the plants in those tanks do just fine in low tech setups with play sand.
And then you ask to have a few plants yanked from the tanks and he makes sure that you are going to be planting in a tank that is exactly like he's scrawled on the glass. I'm not sure if he wouldn't actually sell a plant, I haven't tried telling him they are for a low tech tank.
I was in the store today and looking at the fish tanks I noticed on some of the apistogramma tanks (not all?) that he had written "high temps and RO water." I've never kept apistos so I don't really know, but I do know people who keep all kinds of apistos and I know they don't use RO water and the fish are perfectly happy. Curiously, he doesn't have anything written for any other fish that would be happier with softer water, including the discus.
I'm tempted to attempt to buy a pair of apistos and tell him that I'm not going to be messing with my tap water and see if he'll still sell them.
I just thought this was a curious situation.