Apparently, Iron Chlorosis can be pretty difficult to correct... personally I like to try to do what I can to resolve the issue when I have a sick plant, within reason (cost-wise, time-wise, etc.). It often comes down to what you can live with and what you cannot. I am not sure about the long term effects of iron chlorosis on Maples, but it would be worth looking into. If the long term effects aren't serious and the discoloration doesn't bother you... I'd say just let it be
There are plenty resources online with useful info on the subject... Here's one for starters:
https://www.extension.purdue.e...
Hope that is helpful!
