When mature leaves are not affected, the more likely cause of interveinal Chlorosis in new leaves is iron deficiency. Nitrogen and magnesium deficiency will show in mature leaves first.
The problem may not strictly be a lack of iron although use of an all purpose fertilizer containing micronutrients should fix the problem if that is the case. pH of the planting medium can make it difficult for the plant to utilize available nutrients,iron being particulary problematic if the pH is alkaline or even neutral for example. a foliar spray of something as simple as miracle grow all purpose with micronutrients should do the trick in that case. or alternately a foliar spray of ferrous sulphate but that is likely a hassle just for a couple of overwintering peppers. Really, is the goal to grow peppers or to just keep them going, not to look perfect and produce? If so maybe just not to worry too much and prune them back so they don't have to work so hard in low indoor light. increase fertilizing when the light is better toward spring. All depends on your goals.
KarenO
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