Will Red Tail Shark Eat Snail?

I have a 45 gallon tank and recently added a red fin shark to the community. It is a fairly new tank, 4 weeks old, and I want to add a snail or 2. would the shark harass the snails? the lady at the petstore said he could eat them when he gets larger.

 

They don't eat snails, you'll be fine adding them.