Just my 0.02 ,you'll be fine if you remove the fish that'll outgrow the tank anyway (common pleco,rope fish)Just keep up with water changes (atleast once a week))at one point I had 22 angels in a 75g

although did have to do 60% Wc every 4 days. The Black skirt tetras I had nipped at my angels leaving their long flowing fins tattered the .I have no idea about the barbs.I would keep a few angels ,a small school of tetras and a few corys.Keep in mind that if your rope fish decides to swallow a cory the spikes on it's pectoral fins will lead to the ropefish chocking.GL