Looking good.
You can see those aureaus are going to be stunning. A mature male aureaus with fins erect with long trailers really is a sight to see.
Your patience in finding some quality aureaus will be well rewarded.
The scape is looking nice and as the plants mature will work well providing retreats and areas of resting for females that may not be ready to spawn.
Personally I would not add a pleco for 2 reasons. First of all it would spoil an otherwise geographically correct mix of species. Some pleco will also graze on algea that would provide a food source for your livebearers.
I also think they may munch on your cichlids eggs at night,should they breed.
Tank looks really nice and I think the stock will work great as it is.
Look forward to updates.
Thanks
