empty 20 gallon

I'd love to do a shell dweller tank. But I should see wheather or not any shell dwellers are avaliable in any of the pet stores near me first. So far right now I'm thinking of either setting up a female betta sorority tank, a shell dweller tank, or get a puffer. My other option is I could just transfer my dwarf gourami's from the 10 gallon to the 20 gallon, and then just get a male betta for the 10 gallon.
 
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