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New leaves always come out a much ligher shade of green from my experience and they darken, as they become mature to the same green as the older leaves. If you think about it that's not uncommon for almost any kind of plant I can think of with new leaves being much lighter in color than mature ones, though in some cases new leaves may even be a surprising different color such as maroon, or pink or red in the case of some plants though they'll turn green as they mature as well! In regards to the color later on however, it can be a good indication of if the plant is getting sufficient bright light, since the color on plants getting enough light can have darker leaves than in lower light, and with sufficient light on the "reginaes" the leaves develope a pink midrib on each leaf!

What species "Bird of Paradise" are you growing? Can you post a picture of the problem?

1 or 2gph emitter is good; one gallon is probably fine. Mine did so much better when I stopped watering by hand, but it's a pain to set up drips...