Ghost shrimp add very little to your bio-load, especially when compared to a goldie. They actually help clean up the tank byy eating any food the fish miss.
Having said that, realize that the one inch of fish per gallon rule is complete bunk. How can 10 one inch neons produce the same waste as one ten inch oscar? It's not logical. Furthermore, how much and what you're feeding, the temperature, how frequently you do water changes, etc, all make a huge difference as well.
Bio-load is the sum of the waste production of each fish in your tank. Small, light bodied fish produce less waste than large, thick bodied fish. Right now, your tank is heading for some problems based on several factors. 1) the bio-load will eventually be pretty heavy as all your fish mature. 2) You have fish which have very different water preferences (orandas prefer slightly cooler waters, guppies like harder water, depending onthe pecies of minnow it likely prefers cooler waters as well, the pleco will be okay in most waters).
If these were my fish, I would get rid of the pleco and get one of a species that will stay smaller. I'd separate out the guppies--thye'll over populate the tank, given the chance. If you have no need for the babies, keep the boys away from the girls. Ditto for the platies, if you have a male and female. They'd like a tank with hard water, at about 78. The oranda will need a large tank, and the temp should stay around 70.