Can someone help?

such a hard question to truly answer as each fish reacts different to any other fish.
But a good rule of thumb would be to only keep fish of similar size to the lionfish (at full size) in the tank.
Example being if the lionfish grows to 5 inches , (not sure exactly how big it gets) don't put any fish smaller then 4 inches in the tank.
Although sometimes fish will eat other fish of similar of bigger size..
So again .. best bet is to have similar size fish
 
I would go with a fish that will be larger than the dwarf at any given time, I have seen videos of them eating fish as big as they were.
 
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