Predator fish in a 40g

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Hey everyone! Okay so I keep asking these questions because google is unhelpful but I have a 40g (36"x14"x18"), and I want fish that can go with a snowflake Eel and a pair of tomato clowns also while being Euphyllia safe. ANy suggestions?

 

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Bump (Sadly lol)

 

[lion king]

What exactly do you mean by "predator fish", it's a term that is used somewhat loosely. A 40g is a tough tank for a true "predator fish", which I would list as lions, scorps, anglers, toadfish, groupers. A 40g would be too small for most of these fish, and the ones you could house in a 40g, would likely eat any other tank mates that could live in a 40g. Many true predatot fish also have specialized care, especially in regards to feeding. So more research on your part may find you more answers.