I ended up filling 4 of the new seachem 110 hob filters with the spheres on low flow and the 2 aquaclear 110's on low flow putting the sponges right on the intake and in the whole filter compartment I situated the blocks.
The blocks are more fragile than I thought so I might change it up and just put them in a corner of my tank with a powerhead aimed on them.
Thanks for all the ideas!