Small Ocellatus Cichlids

ok im just trying to figure out something to do with the 5 1/2 gallon. I want to just get rid of it and buy another 10 gallon but my dad wont let me because he says i have enough tanks already because i have 5 including the 5 1/2 gallon.
 
i recently had a betta 3 bettas and they all died. I think it was because of the water conditions in my area. I do like them but i would like to do something else with this tank.
 
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