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Iron fertilisers are needed but if you want really good red colours out of your plants the light intensity must be bright and the light spectrum should have strong red end.

The red colour that you see on plants are really because the plant is protecting itself from intense light - they are reflecting the red in addition to the green - more red that your light spectrum has more the plant will create the red pigment to reflect the light - and more intense red will be the plant. Then that also means that the rest of the spectrum must be sufficient for the plants need of energy for photosynthesis.

So intense light with a strong red spectrum and keep up your CO2, macro & micro fert dosing.
 

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https://www.youtube.com/watch?v=y4WNMBKKVjU

It is mostly about intense light and plants need to be VERY healthy
And,,,,to have healthy plant's under intense lighting, one better be able to provide some carbon (CO2), and nutrient's on par with the light energy being used.IMHO
Lot's of folk's bombard their tank's with uber lighting and fail miserably.
 

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https://www.youtube.com/watch?v=y4WNMBKKVjU

It is mostly about intense light and plants need to be VERY healthy
I did an experiment following the suggestions in the video. Results: nothing - plants were no redder than they were before. Conclusion: the video provides a lot of fanciful talk that sounds convincing but is just that, fanciful talk with no results. It was not high light intensity, temperature, or the increase in fertilizers, low nitrogen, etc.

So I did another experiment which I've written about in other forums (ASW, AquaPetz). I removed a dozen 6500K LEDs and replaced them with full spectrum LEDs, LEDs with very high red spectra. Results: in less than a day, plants turned noticeably redder. All new growth had considerable red content. Conclusion: it is specifically red spectra that induced the production of anthocyanin, not the intensity of light, fertz, temp, etc. It appears that a natural spectral curve is all that's needed; adding more red spectra won't produce any more anthocyanin than it's capable of.
 

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I did an experiment following the suggestions in the video. Results: nothing - plants were no redder than they were before. Conclusion: the video provides a lot of fanciful talk that sounds convincing but is just that, fanciful talk with no results. It was not high light intensity, temperature, or the increase in fertilizers, low nitrogen, etc.

So I did another experiment which I've written about in other forums (ASW, AquaPetz). I removed a dozen 6500K LEDs and replaced them with full spectrum LEDs, LEDs with very high red spectra. Results: in less than a day, plants turned noticeably redder. All new growth had considerable red content. Conclusion: it is specifically red spectra that induced the production of anthocyanin, not the intensity of light, fertz, temp, etc. It appears that a natural spectral curve is all that's needed; adding more red spectra won't produce any more anthocyanin than it's capable of.
Hmm, this must be why my Ludwigia (dirted, occ excel) and AR mini (sand with ferts in substrate, occ excel too) growing in the basement north-facing windowsill (frosted glass, no direct light at all) has the best colour out of all the plants (in various artificially-lit tanks) that I have.
 
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