02-05-2013, 12:43 PM
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JS1221, as this is I believe the first time I have posted in a thread of yours, welcome to Tropical Fish Keeping forum.
As others have noted, we need more data. Including the plant species; this may be "normal," or it may not. A photo of the plant and of the tank might also help.
On the "reason" the store employee offered, this is the first time I have come across it, and I can see where it is coming from, but I also don't think it is likely or most of us who use conditioners which contain some form of fish stress protector/slime coat replenisher would have dying plants, and we don't.