Finally have some time to update.
The stock has dwindled down to just a pair of synspillum, a pair of Bifasciatus and an argentea. During the time it was fully stocked, there was way too much aggression. I did enjoy the active community but felt horrible for the fish and knew they could not grow to full potential if I didn't thin the stock down. Additionally, I did lose one synspillum and think it was the Midas, but could be multiple culprits.
For now, the setup is working with each pair owning half of the tank while the argentea hangs out and tough to fend for itself.
Here's some photos.
Full tank
Group
Synspillum pair, love these two!
Bifas male, as viscous as he is gorgeous!