Shrimps keepers I need your advices!

So recently my shrimps have been dying after they molt, water parameters seems fine and the only think I suspect is the lack of calcium in the water to form new shells after they molt.

Did some research and saw some people using cuttlefish bone in their shrimp tanks but I have also seen calcium carbonate in powder form in many supplements store and I was wondering if it is safe for dosage in shrimp tanks? Or should I just buy some cuttlefish bones instead? I don’t really like it as it ruins the scape.

Any advices will be appreciated !!!