We are not rock farming like Reef folks.
We are farming weeds.
When their roots get going, they pump large amounts of nutrients in/out of the substrate and add O2 down there.
So think about a DBS and plants being equal rather than the live rock. DBS's are likley much better exportors of NO3 as it is.
Best bet: focus on what it takes to grow plants well.
Happy plants= happy fish.
Do not fall into the Discus for Zealots trap, unless you plan on commericially breeding.
1-2x a week water changes with RO/tap etc(50% or so). RO is the way to go if you plan on reducing KH(GH can and should remain at relatively moderate to high levels, it's Ca, Mg, SO4 etc, all plant nutrients). Temp about 82-84F.
Auto water changers are very nice if you can get away with the KH from the tap(what is it?).
Many folks use wood in fish only tanks in a similar manner.
But.................................most end up thinking about adding plants all over the wood.
As far as wood inside a filter: bad idea. Wood slowly rots and in there it'll rot faster and as said, not much surface area internally that is optimal for bacteria.
We grow plants here, not bacteria really.
The same is true if you grow marine macro algae, do not use a skimmer, you will not need it.