are you wanting to use the 60L tank as the breeding tank?
if so angels and severums and most cichlids except maybe dwarfs like apistos etc are a no no. even bolivian rams would need more than that in my opinion.
if your looking at making a few quid then re-think. the costs of running the tank, water, dechlorinater, food etc etc etc isnt cheap and to sell a few fish for a few quid will no way cover the costs of the set up and running it right. the fish will have to be grown to a size thats selable to the shop which again costs you in feeding and running. you will also need more than 1 tank as the fry will need their own tank and then grow out tanks that are big enough to grow out the amount of fish that hatch. then unless guarenteed to sell every fish you will need holding tanks for the bigger fish so they dont harm the fry or smaller fish you have raised. corys have between 50-120 eggs every spawn so potentially thats a lont of fish that need to grow to roughly 1.5 inches before they can be sold on. angels lay 100's of eggs as do most cichlids.
a breeding project is a great idea but dont think you will make much money from it unless you have something that little bit special to breed. even ray breeders hardly make much cash.... it takes up lots of time and effort to breed fish successfully and to produce quality healthy fish.