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As I am not familiar with the fish as I have just recently started reading about africans, so I can not comment on them. With my understanding bio balls work best with the trickle effect as the oxygen. But people have had success with just poret foam so if you want the higher water volume go with the larger sump. if you want more space under the tank go with the trickle and the Rena xp3 for more mechanical.
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