There are other sources of Calcium for your shrimp apart from dosing Calcium sulfate or dropping shells and cuttlefish bones into the water column. These sources come from the foods we feed the shrimp. These are all natural sources of food, so should be okay to feed your shrimp, just be careful you wash them properly and ensure no fertiliser/chemical residue is on the veg/fruit. If you grow it yourself, you will be sure of what was sprayed on the plants. Here is a list of vegetables and fru