He can easily do an aro for life in a 300 gallon rubbermaid, that's better than what mostaros end up in. It'll have plenty of swimming room and won't get spooked from activity outside of the stock tank. You would still need some type of cover or netting but aros can easily be done in a 300 rubbermaid.
Yeah an aro would fit but.. A Rubbermaid with a top... Ugh.. How are you gonna view the fish.. Aro will jump without cover.. Even with a clear cover its gonna fog up
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