Ordered 2 bags of black flourite for my 20 long (Dr Foster and Smith). I have flora max in my 20 tall. Both are cycling with dr tims ammonia. Comparison... None yet. Have to say the flourite wasn't nearly as bad as I have read as far as washing it goes. Probably took me 35-40 minutes for both bags. Didn't cloud my tank up at all either. Very pleased so far.
I have poll filter sand in my 55 gallon. Can't wait to get these 2 20's cycled and planted!