Each C4 is rated for 264 gph giving a total 528 gph. I can load each C4 with bio-max in the carbon chamber. Will add a Koralia Evolution 850 to stir up the bottom.
that should be PLENTY...they will provide adequate filtration...the powerhead will be the key...make sure it's doing a good job keeping poop in the water column(where the filters can grab it) rather than on the substrate and you will have crystal clear water hint... you might be happier with sponge rather than bio max in the carbon chamber