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Seashells are made of calcium carbonate. This buffers PH drops (which is good) and it also affects water hardness by preventing it from getting too soft.

If you put a shitload of seashells in the tank it may raise PH and water hardness (as the two go hand-in-hand). A couple shells will simply buffer these parameters.
 
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I've found that a few seashells will not have a dramatic affect on your pH.

I put a bunch of seashells in a 29 gallon that always had a low pH problem because of the driftwood it contained. I was expecting the shells to quickly dissolve and buffer the pH, but this never happened. The shells remained and if they are affecting the pH at all, I can't see the difference.
 
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