power heads for 125g

Depends on how much rocks you have. If it's wide open with not much rock, it may be ok. Otherwise, there would be some dead spots.

My tank has 2 Koralia Mag 8s, 2 VorTech MP40s, 1 MP10, and 3 other older Koralia. Only the VorTechs are always on. The Koralias are controlled by an AquaController Apex System to provide surge current on different area.
 
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