Have you ever kept shellies at all?
Multies are the smallest species of cichlid on earth (at least known) and max out at 2". In a 10 gallon, 5 adults can be kept, although 4 typically is a better number with a ratio of at least 1 female per male, or a harem (like 1 male, 2 females). A 20 long is much better suited for any shellie species.
Ocellatus max out at 2.5 inches, maybe 3... Typically more towards the prior. They are not typically gold, as that is a color morph known as neolamprologus ocellatus "gold". I personally own neolamprologus ocellatus gold "purple" and look nothing like gold occies.
Also, brevis tend to be similar size as occies.
2-3 shells per adult is on the low side. 4-5 per adult is a much better number, if not more, as adults lay eggs in one shell, and as the babies grow, move into neighboring shells. My female's keep nests of 5 shells typically.
With that being said OP, you have said you researched, my advice, go research A LOT more, then bring the refined questions to us.
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