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+1, RO may be a "factor" but it isn't "a problem" per-se...

RO *shouldn't* be a problem if you are using RO water properly and adding back in sufficient minerals and fertilizers for the health of your plants and fish. The fact that RO appears to be misused without minerals or fertilizers is a problem.

Looking at your plants, they are showing yellow margins of the leaves.. that is most likely potassium deficiency.. However, you're going to find that once you fix that, others will follow suit.

Plants need 14 nutrients/minerals in order to grow. Aquatic plants are no different than land plants in this regard.
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