I don't think we can get a true picture of how well a tank like this works without seeing it evolve. We don't know what fish have been bullied or removed as a result of hyper dominance in a crowded situation along the way. We also can't say what the future will hold for this tank. Some of the species in there look like they are about to hit maturity, this could cause issues further down the line.
I think some of the species like the before mentioned cichla could become stressed in there, due to more boisterous natured tank mates. Time will tell.
We all look for different things in our tastes for the perfect display tank. While I do see some very attractive cichlids, I also see fish forced to live in very uncomfortable cohabitation and a high potential for disaster.
I could also be proved completely wrong and all the fish will get on for life. This I find doubtful. Personally I wouldn't risk it.
It's a 700 liter net water aquarium. I grow fish for more than 40 years...
The mass rules are known to me but.... the real rules for quality fish life and harmony, (and you can check it on your own lives) is not only the total mass of organisms in a given area or volume but:
Once this has been achieved I am happy
- Excellent quality of water and air
- Good food
- Minimal Aggression
- Perfect shapes and fins
- Smooth and continuous growth
- Great appetite
- Couples move to their own aquarium
- Refreshing the neighbors from time to time
- and so on...