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With that many endler females you are going to be absolutely FLOODED with fry. Each one will have around 30 monthly. Even if 90% of them get eaten that's still going to be 40 fry a month.
Some other fish you could look into would be:
A single dwarf gourami
up to 2 small plecos most common would be a bristlenose
6+ Praecox Rainbows
6+ Cory Cats
6+ Neon tetras
10+ Celestial Pearl Danios
6+ Hatchets
6+ Harlequin Rasbora
Mollies
Platies
Red Cherry Shrimp
Nerite Snails
I would add the GBR later on after the tank has been up and running for a little while.
Generally people will pick 2 - 3 schools of fish and then a few centerpiece. Your choice of endlers limits your pick of fish by a bit though so the biggest centerpiece I would suggest getting other than the GBRs would be a dwarf gourami.