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You can use up to a 50/50 mix of flourite/plain gravel according to the instructions from Seachem. I did this in my 48 gallon. I used two bags of flourite, mixed with some similarly colored gravel. I didn't do layers, I mixed. Works just fine.
On a 20 gallon, I personally would get one bag of flourite, and mix with gravel. You save money and some rinsing that way.
Of course, this is if you're on a budget. YMMv, IMHO, etc.