generally speaking, if your water is already hard and alkaline, as are many if not most municipal water supplies throughout the states, then the addition of 'cichlid salts' for African Malawi species will do neither good nor harm. if on the other hand, you're keeping Tanganyikan cichlids or your water is soft (low TDS), then the addition of Rift Lake salts will benefit them.
since you're using Eco Complete substrate which is basically aragonite (calcium carbonate) your water chemistry should be fine without the need for the addition of cichlid salts.