what should i do

So I've been thinking about setting up another tank it would most likely have to be under 20gal. I'm trying to decide what i should put in it, I've though about moving my clown fish out of my main and turning my main (55gal into an aggressive tank) or if i meet the requirements an octopus would be cool as would a mantis shrimp. Just wondering what you guys think? Most likely if i moved my clown fish out of my 55gal i would like to add a small snowflake eel and a small porcupine puffer, Just can't decide what do you guys think? Also please note i know they would outgrow the 55gal but this wouldn't be long term as I'm moving next summer.
Thanks,
~Nick
 
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