Tunze 6045 ?

[riche]

Would 2 or 3 of these be enough on a 90 gallon mixed reef?

 

[joseserrano]

Maybe. You can always add more

 

[MJ in Boise]

They push a ton of water for their size, but I think 2-3 of them isn't quite enough.

 

[mfinn]

Those are more for smaller tanks. I would look at a bigger Tunze.
Something controllable.