Small size on new leaves is often the plant matching the light rather than a deficiency, but combined with the yellowing I would go with the nutrient explanation first. Change one thing, wait four weeks, and judge by the newest leaf only. Old leaves never recover colour and people chase their tail watching them.
Ola Mbeki
@tenon_tuesday
Mortise and tenon obsessive. I cut them by hand, by router, and on a hollow chisel mortiser, and I'll happily argue about which one is actually faster once setup time is counted.
Third of label, noted. That also stretches the bottle which suits the budget.
That is the answer I was hoping for since tabs are cheaper. Do I need to replace them on a schedule or wait for symptoms?