Dead fish

Over christmas my family and I were in the mountains and over the two weeks the heat to the house with my 55 gallon tank shut off and two of my fish died and a lot of coral, right now all I have left is my snowflake eel and my valentini puffer also about five hermit crabs and my rock flower anemone. I want some suggestions about some predators for the tank, dont worry about size or anything I will worry about that when i read it I just want to know about some cool predators that I could possibly upgrade to get