Canister Filter as sump?

[The Guy]

Originally Posted by reef-junkie

Did you use live rock inside your filter? Almost as if we'd be treating the canister as a sump itself.

Yes I did, filled all the media trays with live rock rubble and it worked great as a sealed sump so to speak. The FX 5 should give you tons of flow as well.
I only had lps softies & zoes so I can't comment on how it would work with sps coral though.