Guppies are supposedly estuarine fishes like mollies and can be slowly acclimatise to full marine setups. Even though that is the case with mollies, I would not recommend doing this even with that "diamond water" thing you mentioned. A wrong move can lead to death for both clown fish and guppy.
What the shopkeeper is doing to the fish is equivalent to torturing the poor clownfish and guppy.They come from differing habitats and should not be kept together.
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