I was in the process of removing the two zonatus and the bigger melanura to open more space but I had zero issues with aggression in that tank
I have seen many mixed ca community tanks as well, but have seen very few that have lasted more then a few years, only the ones in +400 gal seem to make it long term I would also point out there's alot of split fins in the video you showed so there is some aggression in there. If you want to go ahead and do this type of tank then it's up to you and all the best to you. Just imo (for what it's worth) you will lose some of the personality of the fishI've seen many, many tanks with combined central Americans that didn't seem to have any issues. I had a 210 gallon central American community tank a few years back with even a female red terror with zero issues. That's the beauty of the vieja species is that they seem to do well with other fish. I'm mean ya I'm sure you're going to have your one or two trouble makers, but you can always remove them. Here's a video of my community tank.
Ya I totally understand what you mean. The fish with the split fins were fish I had recently acquired from a guy which was a big reason I was getting rid of them but I never noticed any aggression in that tank. But the more I think about it, I think just having a nice pair in the tank would be the most pleasing. I have always wanted to create a very realistic looking tank too so maybe just throwing a pair of them would be pretty awesome then I can just move and try to sell the fry.I have seen many mixed ca community tanks as well, but have seen very few that have lasted more then a few years, only the ones in +400 gal seem to make it long term I would also point out there's alot of split fins in the video you showed so there is some aggression in there. If you want to go ahead and do this type of tank then it's up to you and all the best to you. Just imo (for what it's worth) you will lose some of the personality of the fish