I don't think it would be underpowered as is for a 120, the 9015 cup lets you open the air up almost all the way, for that matter with the DC pump you can get a lot more power with the big cup as the DC pump is stronger, at half power the DC pump has the output of the AC pump at full power.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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