This is the fun part  trying to figure out what to get lol. The barbs should be fine together as long as there in a school. As for cichlids, if you want them you will need to get some water softener. You could go with dwarf cichlids like Rams, Apistos, or Kribs. If you went with one of the dwarf cichlids you should get a male and female. good luck 
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75G-4 silver dollars, 1 angel,2 BN plecos, 1 RL pleco ,2 golden opaline gouramis,4 doradids,Male nicarguensis cichlid, 1 golden wonder killie
55G-Angel pair, 3 corys, 4 harlequin rasboras, 3 pristella tetras
30G-Angel pair
30G-1 angel, 1 female krib
30gal- 2 female bettas, 4 rummy-nose tetras
20G-1 angel(grow-out tank) |