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So it's super low light. The plants I mentioned above are about all that will live. Oh and floating plants because they are near the light. Duckweed, hornwort, frogbit.
Your doing well if it's growing under incandescent bulbs. Swap them out for cfl rated 6500k or ' daylight' and you can grow quite a lot in there.
What I was asking does the plant have a bulb? Did it grow from one? If it did it would be a apogenton of some sort.