There is a skeletor, snowflake, fimbriated,white eye, and dragon moray as well as three sand sifter star fish and a starry night octopus. The truck is adding one at a time and slowly. Also in a communal predator enclosure everything comes down to feeding. I have had over 25 years dealing with communal setups from tropical frogs from all over the world to even a form of communal tarantulas. I decided when building this that I was going to try a predatory communal tank again with the addition of corals this time around. So long as your feeding schedule is on point they don’t get aggressive. So far I have had zero incidents in the 6 months it’s been up. The hardest part is dealing with protozoans. It’s impossible to try this and quarantine and not expect the parasites to find a way in through bottom dwelling predatory fish. So long as you don’t mix two of the same species and again monitor feeding and keep a schedule of what’s eating and when it’s really not that hard. I spend a lot of time with the system and have learned that you can in a way train them to an extent. They recognize you and you get to know their behaviors as well.