How's this for red?
At the time of this picture there was no iron dosing what so ever, just clearing that up first.
That is hygro kompakt, an typically emerald green plant. I now get the same results with hygro araguaia as well.
I find that if you want red's to come out, you want to be sure to use neutral whites in your build. Cool whites are great for green plants, but typically just don't bring out the reds well. As soon as I ramped up the intensity from my neutral whites, the reds just burst out.