SunGrow Mineral Rocks - Calcium Supplement for Fishes

I was skeptical at first putting these in my tank. I have a 125 aquarium with African Childs, with about 40 fish. So I wanted to find information and exactly what the benefits are.

Remove toxic chemicals, mineral stones act as a national ion exchanger that cleans water in the aquarium.
Even stores toxic substances like heavy metals and ammonium for a longer duration.
Minerals boost health, provide the perfect nutrient balance for viability, color and health. Full of magnesium that is essential for all crustaceans to maintain health and vibrancy.
A national mineral that can only be harvested and not made.

I have had it my aquarium for about 2 weeks now, and I personally haven't noticed a difference. I don't know if it's because my aquarium is to big or what.
Now my fish will go and check it out at first, but after that they didn't want anything to do with it.
This why I'm only giving it 4 stars.

I hope you find this information helpful in your buying decision. I received this product for a discount in a exchange of my honest and unbiased review.

https://www.amazon.com/SunGrow-Mineral-Rocks-Calcium-Supplement/dp/B01FD4S9MI/ref=cm_cr-mr-title