|Old leaves turn yellowish/ red||Nitrogen deficiency|
|Leaf loss and small dead areas||Phosphate deficiency|
|Black/ brown leaves, plants die||Excess phosphates|
|Yellow spots on old leaves and yellowish margins on|
|Yellowish margins on young leaves with deformat|
|Yellow spots on old leaves|
while veins stay green
|Young leaves turn yellow|
|Yellowing leaves starting from the tip then become|
|Yellow spots between the veins, margins and tips||Zinc deficiency|
|Plant stays small slow or now growth white deposits|
on leaves (calcium)
|Fish gasp for air on surface||Excess CO2|
|Sluggish fish no plant growth|
|Plants stop growing/ black roots||Substrate problem|
This is a classic sign of iron deficiency in plants.
Iron is a MICROnutrient and although thought for many years that iron(as well as phosphates p04) cause algae it does if to much is in the tank and other nutrients are not balanced.
This is a classic sign of potassium deficiency in plants.
If potassium is not available to plants the start to disintegrate showing holes and leaves go very brittle.