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Duckweed new growth is white

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New growth seem to be VERY pale.
Duckweed is spreading very slowly and new growth is whitish, and I'd actually like it to grow quickly.
Anubias Barteri new growth is also somewhat pale compared to old leaves.
Crypt Wendtii Red is now brown but healthy.

Tank is moderately planted, at least until everything begins to spread.
I'm using API Leaf Zone for iron, Seachem Phosphoros, and Nutrafin Plant Gro for other nutrients. I also use Aquasoil.
Using DIY CO2.

All of these I dose once a week after a 25% water change, at the recommended amount suggested on the product.

Do I need to dose more? How often and what amount of which product if so?

pH: 7.2
Ammonia: 0
Nitrite: 0
Nitrate: 20-30
Temp: 25C


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9 minutes ago, Mmiller2001 said:

You are not dosing enough Macros and you might be dosing incomplete micros.

If you can please tell me if something is missing from this list, I'll definitely get it:

  • iron
  • potassium
  • phosphorus
  • nitrate
  • boron
  • copper
  • manganese
  • zinc

Would you suggest I double the amount of Leaf Zone then? Or maybe double is too much?

Edited by BaRanchik
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I'm not familiar with Nutrafin, but you will want to dose a comprehensive Micro, something like Flourish Trace or Comprehensive. If you look at the label on Flourish Comprehensive, it list a good "spread" of Micros.

In low tech tanks, with say 25% water changes per week; I would recommend:

7 ppm NO3

0.7 ppm PO4

9 ppm K

0.7 ppm Mg (optional)

0.35 ppm Fe

These number are per week and Fe is a target. So dosing .35Fe from a good blend of Micro fertilizer will hit all the needed amounts of other Micros.

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