I think you can get away with potted hardy ferns or sword plants.
A little light[eg, 2x36 phillips 4ft 865] short lighting period-4 hours daily on timer so that you can reduce appearance of algae.
In this case you need to reduce the blackwater. That will block light out needed for photosynthesis.
Side note: quite happy my alts are back to their piggy selves again.
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