The substrate particle size and condition are really important - I notice
your substrate in the pictures looks a bit fine. My gravel in the new tank
is two layers - the lower one with the balls in it is 1.0-2.5mm grains and
the upper one which is thinner, is black and has a particle size of 3 - 5mm.
Some of the more sensitve "rooty" plants are in plastic pots with clay kitty
litter and DD balls, with the top layer gravel on top and others are just
stuck in the tank gravel - there is no difference I can detect in root
formation or health in using either planting method btw.

The main thing I am trying to say is that substrate health, compostion and
macro fertilisation are probably more important than the light spectrum
itself.

I've had plants do just great with no substrate and in the tank you're
seing in my pictures the plants went crazy after I replaced the screwins
with two 40W CF lights.

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