I'd say you have a problem as this doesn't look like normal new growth. But an iron deficiency has the veins staying green and the area in between yellowing. This looks to be the opposite with the veins yellowing. Has it been cold? If so maybe a nitrogen uptake issue. (Plant looks super green on the older leaves, so would think it has enough.) How's your soil? (Looks like clay). Also you seem to have a lot of dark and white spots on some of the other leaves, have you been spraying anything on the plant? What have you been feeding it?
Edit: Reread your post and now see that you haven't been fertilizing, just tea. Apply a balanced fertilizer. Have no idea what's in your tea, but normally teas are used to feed microbes, which are attracted to the root exudates, which attract bigger microbes that eat the fungi and bacteria and produce waste that plants can readily absorb. The tea is used to increase microbes, not supply the nutrients that your plants need.