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The difference is the price!! Fish shops charge a fortune for it and you can pick it up for peanuts and in many different colours in garden centres! I always buy my slate from a garden centre and have never had a problem. Just make sure you give it a good srub in the bath before putting it in your tank as they are very dirty.
I did smash a big 'rock' of slate up a few months ago for my tank and it has been fine