I'm not sure of the grow rates of most of those fish but I know the oscars will grow very fast! I could see a problem with the silver dollars n oscar.I can't keep anything with my oscars but plecos.but a buddy has all kinds of stuff with his oscars. I'd probably add the oscar last n hope for the best n exspect or prepare for the worst. Gl hope you have better luck than me
Lol if it were me I'd keep the oscar n ditch the rest! But I like oscars! Even though they probably the pigs of cichlids! Aren't no silver dollars going to interact with you like a oscar will!!
for the bottom, i would ditch the sens and just go with the 3 dels. 3 full grown dels will be plenty for the tank. just my 2 cents. i really do like your tank. great job!