Whoa big fella! LOL Looks like you stocked that tank pretty quick. Has your cycle completed? If it has it barely is and has to grow gradually as you add livestock. You may wind up back in a cycle.Here is a better pic of them all. A few people on another post said angels and Oscar's should never be kept together or should they be kept with African Cichlids either.....but so far everything is going great. They have been together about a week and a half now and anytime the Oscar sees me step closer to the tank he swims from one end of it to the other (only does this when I'm nearby) so I enjoy watching him. There have not been any signs of aggression AT ALL (even with the africans) but I believe the reason why is because they each seem to have their own claimed territory.
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Ok, livestock. you really don't have a good mix for that tank. The silver dollars and the Oscar are gonna get big...and quickly. The angels may get picked on by the Africans, time and temperament will tell. Not sure which Africans you have but look like you may have some mbuna. Their diet should be high in algae and vegetable foods and lower in protein. The angels and Oscars want a higher percentage of protein in their diet. The high protein food can cause bloats in vegetarian fish but the mbuna will eat the food meant for the others along with what's meant for him.
Stocking compatability can be subjective. You want the fish to not only get along, but be as physically healthy as possible, as well.
Mark