Probably not, in fact I would say definitely not. A clam extracts calcium to build it's shell. You would need to see alot of new shell growth really fast...and that doesn't happen.
PurpleUp is not a product to supplement calcium. It's such a weak solution that you can probably pour the whole bottle in and only see a small rise in your calcium level.
So the questions for you....
What salt do you use?
What kind of water for water changes and top offs? RO
? tap? well?
Water parameters - nitrate, phosphate, calcium, alkalinity, magnesium?