It would help if you could provide a little more information. What do you dose now ? What is your GH ?
Yellow leaves are often associated with low available nitrogen (ie low nitrate). However what I am seeing in the images are white/yellow patches not the gradual yellowing common for N deficiency. I have seen similar symptoms when I limited Mg...
MgSO4 or epsom salt is easily available and does not cost much so I would recommend to start here and see if the symptoms dissapear. Aim to have around 5-10ppm Mg (not MgSO4) in your tank.
Hope this helps and if you need help with the calculations let me know.
Hi Duky, my GH is between 4-5
As for dosing, it is different from EI, but I had been using this formula for coming 9 months, everything was well until this current issue
K - 4.2ppm (KSO4)
PO4 - 0.5ppm (KH2PO4) - dose separately to prevent mix with FE
FE - 0.05ppm (FE 10%D)
K - 1.75ppm (Lushgro 5% KNO3)
NO3 - 2.0ppm (Lushgro 5% KNO3)
PO4 - 1.0ppm (KH2PO4) - dose separately to prevent mix with FE
FE - 0.04 + Micro Nutirent (Lushgro Micro)
Repeat the above + WC every 7 days
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