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Assuming that they are low power LEDs you probably want to stick with some of the hard to kill stuff like java ferns, anubias, bolbitis, and mosses. You could always try a few slightly things (green stem plants and crypts primarily) but your mileage may vary.
2. Mbuna will destroy plants
Amazon sword, Anubias nana, java fern, Marimo moss balls, water wisteria, water sprite, anacharis, there are a lot if plants out there