Leaf yellowing

I think there is a similar thread but this is a different problem......I bought some geraniums....alot are doing well but some new ones are getting leaf yellowing......they are all in an enclosed space and not planted in the ground......balcony pots....was wondering if it was iron deficiency....someone suggested too much watering.....they were quite heavy when I bought them and not dryish.
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Ok, thanks Verdun,