7.5 gallon betta tank

Honestly if I were you I’d make it extremely planted and get a mahachaiensis betta and *mabye* a baby half banded spiny eel. Mine only uses like a 1 square foot section of the tank and that’s how big the 7g is (he’s like 5-6” rn and is doing awesome. I’d probably upgrade him to a 15 as he grows in your situation they are very sedentary and only reach 6-ish inches)
 
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