Is this overkill?

[pollyandpear]

Would it be overkill to use an Aquaone 850 on a 70 litre tank?

I currently use the fluval u2 but would prefer an external filter for aesthetics and to make more room in tank, and I happen to have the Aquaone 850.

 

[seedoubleyou]

Not necessarily no. You could always dampen flow with glass filter pipes and use an outflow pipe called a “spin pipe”.