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They are in balls because of the way the roll in the current. I have mine spread out and tied to driftwood. You would need alot to use as a carpet Amano has been doing it for a few years. The only problem is that the algae is verrryyy sloooww growing.
I take it you want to start an african tank. If the reason you want holy rock is to buffer the water, dont waste your time. It doesnt dissolve fast enough to buffer your PWC's. You can always just throw a hunk of limestone in there.
It all depends on what your setup looks like. What size light and what plants will help us. Co2 will effect your water params.
Co2 will soften you water slightly
In poorly buffered water, this can cause a drop in pH (typically during the night b/c of no photosynthetic activities).
Co2 can...
Running carbon will help with pollution but will also pull out your ferts. There really isn't much you can do about tannins but pwc's and time. Tannins aren't bad, I prefer them in my cichlid tank.
I use it and love it! The best part is that you don't need to pre-rinse like other substrates. It also contains most the nutrients your rooted plants need.
Do you mean TDS? I have very soft water. But for the argument of a sustained tank you can just use ro/di
EDIT: not to mention plants use Potassium, Phosphate, and Iron aka TDS