Mixed species enclosures with marine mammals?

Perhaps not the most shocking combination, but SEA LIFE Sydney Aquarium keeps their Dugong Dugong dugon with Ocellated Eagle Rays Aetobatis narinari, Barramundi Lates calcarifer and a variety of north Australian reef fishes (including but not limited to Acanthochromis polyacanthus, Caesio cuning, Platax orbicularis, Lutjanus sebae, Plectorhinchus chaetodontides, Paracanthurus hepatus, Ebibulus insidiator, Microcanthus joyceae and Pomacanthus imperator)
I don't understand what's shocking in this mix.
Dugongs are herbivorous and peaceful, so there wouldn't be any major conflict with the fish.

In Beauval there are many medium to large fish (cichlids, catfishes, arapaimas...) and Amazon river turtles in their tank, plus Pygmy Marmosets, Golden Lion Tamarins and Coppery Titis on the island over the tank.
 
I don't understand what's shocking in this mix.
Dugongs are herbivorous and peaceful, so there wouldn't be any major conflict with the fish.

In Beauval there are many medium to large fish (cichlids, catfishes, arapaimas...) and Amazon river turtles in their tank, plus Pygmy Marmosets, Golden Lion Tamarins and Coppery Titis on the island over the tank.
I said it was not shocking
 
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