Can't argue with the success!! Ammonia burn? Aquasoil?
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Indeed. It is from the aquasoil.
If uve ever over fertilized terrestrial plants ull see some of them drop lots of leaves and turn yellowy for a while. This is due to too much ammonia. Im assuming this is whats happening because there are no other signs of deficiency. No co2 deficiency as leaves are comming in strong and healthy. Old leaves just look like poop. And, i did let ammonia creep up into the 4.0 ppm range without a water change.. silly me, ive been keeping it around 1.0 but life likes to throw u curveballs sometimes jah?