Yes but I have cut the dosage in half. The fertilizer I use is recommended for both citrus and mango

The damage on the leaves is there for good but monitor the newer growth to see how it goes. Fertiliser can build up in pots quite quickly as there's very little soil to act as a buffer. Regular flushing of the soil reduces the risk of this happening.

I took humic acid powder and flushed them good. Looks like the damages has ceased. I'm switching them to organic being they are sensitive to nitrogen burn.

The thing with nitrogen is that too much can cause rapid but weak growth. That growth is susceptible to damage and pests. It'll have that effect on any plant, to a lesser or greater degree. Annuals are not so bad with that, but trees are.

Yes, very true thats why I half and quarter dosed the fertilizer. Only my citrus trees love the nitrogen but everything else I'm extra cautious.