I feel that your tank is seriously overloaded. In fact, you could probably populate three attractive 29-gallon tanks with the fish you have. In theory, using modern technology, it would be possible to exceed this guideline and add more fish. In reality, however, it is best to be conservative in this regard. Also, be aware that this guideline refers to the adult size of the fish, not the size of the fish at the time of purchase.
Stores generally stock very young, small fish, which keeps prices low.
I would like to suggest that you invest in a good aquarium book that describes the size and temperament of various tropical fish. That way, you can determine the suitability of the fish you want before you bring them home. You mention calcium deposits on your hood and light fixture. The only long-term effective way to counter the high load is to reduce it by removing enough fish from the tank. You could try to lessen the effects of the biological load by doing frequent partial water changes and practicing excellent aquarium maintenance techniques, but this requires continual work on your part.