Tony,
I found back when I was growing plants that that Flourite gravel stuff, underneath about an inch of sand was a miracle. this stuff is a bit pricey if I recall, but really changed things for me. I maily grew that tall val stuff (Looks like fat blades of grass) in straight treated tapwater. I also was using an eheim filter, one of the pro series in a 75 gallon. kept mainly africans, not sure if this makes a difference.
Robb
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