An anaerobic block will encourage good bacteria to convert ammonia > nitrite > nitrate. If you're thinking this idea, then maybe consider a refugium. Either in sump, in tank, or hang on back. That way you can have substrate (aka miracle mud, sand) and live rock rubble.
The mud will release trace elements, the sand will help with help with de-nitrification and the algae will export the latter, growing well with the trace elements. Change the mud/sand out yearly and harvest the algae when it needs it.
If you want to go with a block. There is no harm in adding one, I'd just ensure you keep it clean from detritus (couple of times a week). Sediment that builds ends up becoming a nitrate factory.
The other fairly natural method is a reactor with sand. Which will do the same as a block. Though doesn't tend to build up with dirt quite as easily.
I've tried various methods over the years for nutrient control and frankly the least amount of effort with the greatest results in my view is the best.
Dosing can bring levels down far too greatly and starve the tank, is costly and requires daily efforts. Personally I'd avoid that option at all costs. Phosban reactors again, reduce levels far too quickly and frankly I'd use in an emergency only.
You will also find with a decent cheato / ref setup makes the skimmer is pretty much redundant. If you do add one, you don't need to go all out. A smaller device will do the trick.