You're probably going to need 3-4 9L bags.
Depending on what you want in a substrate is really what makes or breaks it. Flourite's claim to fame is the fact it doesn't turn to mud, but IMO it does require root tabs, at least until it's given a chance to "absorb" some nutrients. It is completely inert. I highly recommend Black or Black Sand over the other "colors", because they are finer and more uniform. Flourite Dark looks like busted old pottery dishes and has virtually no grip. My L aromatica won't even stay in it.
ADA AS and stratum will buffer water and also contain quite a bit of nutrients, but they will, eventually, turn to "mud" need to be replaced. Replacement can be delayed by dosing the column, so the plants aren't drawing all their nutrients from the substrate. It is also very important to note that ADA AS will cause an ammo spike. People say it looks natural, like "dirt", but I'm not fond of it. Perfectly uniform little balls look anything but natural to me, but the color is dark and very attractive.
The definition of insanity is doing the same thing over and over again and expecting different results.
- Rita Mae Brown
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