I also like to use coral chips in my volcano shrimp tanks as a decoration.
It contains calcium, magnesium, boron, nickel, sodium, sulphur, strontium, uranium and and other trace elements.
Coral chips are used in my shrimp tanks as a decoration and also buffer my water parameters
These elements buffer the water and helps in the growth of the volcano shrimp (opae ula).
As the shrimp mature, it shed away its shell or exoskeleton, this shedding process is called molting.
Coral chip and lava chip comparison. I used both in my tanks.