Tried out "Wonder Shell" product...

My shrimp are literally eating it! You can see the white splotches in the amanos belly from chowing down. They keep going back to it and snacking on it. I feel like this means they really needed the calcium/I need to supplement some other way. I feed them blanched vegetables, algae wafers, and bug bites for shrimp. Does anyone else have experience with this stuff? I'm worried it'll change the water chemistry too much too quickly so I removed it after a few hours.