Predator tank sizes

[joshbbert]

Hello starting plans on a predator tank and I'm wondering about size. I would like it no larger than 100g. The tank will eventually be home to my baby snowflake so I'm wondering what other kinds of predators I can keep in just 100g without a having a bloodbath on my hands. Open to any stock ideas really as I'm still no good with fish I.d. But the eel is a must

 

[eatbreakfast]

There are a variety of dwarf lionfish or leaffish that will work. A frogfish would also be compatible with the eel, but can eat anything it's own size and even some fish slightly larger than itself.