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However, if for instance you're running a low-light tank as I am, then you're likely not having intense plant growth which requires pruning all the time. Accordingly, if you're not removing lots of plant mass frequently, then that nitrogen in the plants is still going to remain in the tank's...

That was my second potential question, which alfagrog grain size would be best. For anaerobic bacteria I don't believe the flow rate and the oxygenation are that critical. Flow will happen at the lump surface, but the anaerobic bacteria would be residing deep within the lump where the flow...

Does Alfagrog have an appropriate porosity for growing decent amounts of anaerobic bacteria, in order to remove nitrates? (Just as live rock does in reef aquariums, or media such as Seachem Matrix do). I'm guessing it perhaps does, but it would be good to have some confirmation of this before...