Still not happy with toms.

I'd try feeding them to start with.

when I clicked on the photo, I noticed the new growth was dark green.  If light levels were poor, then these are the leaves that are most likely to be affected.  It's possible that whatever caused the older leaf to go mottled has passed (maybe it was a chill, or a shortage of nutrients before repotting or any other number of reasons) and the damage is done and can't be repaired.  As I cannot see the whole plant, I may be a bit hasty in suggesting that perhaps you just nip off the older leaf.

Here's a better piccy of a full plant if it helps any.