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Yes remove it, it is algae which probably came in on the plants. If you leave it it will spread.
As with house plants, aquarium plants do need some form of fertiliser. Some plants grown rooted in the substrate are root feeders which need root tabbs pushed into the substrate near the plant and replaced every few months (timing depending on the brand). Other rooted plants and those grown attached to decor need a liquid plant food. The two best liquid fertilisers available in the UK are Seachem Flourish Comprehensive Supplement for the Planted Aquarium (there are other Flourishes but only this one) and TNC Lite (not TNC Complete). For root feeders, Seachem Flourish Tabs come highly recommended as they don't make a mess in the water unlike some brands.Don't use any chemicals for the plants.
1x Ludwigia sp. Mini Super Red Live Aquarium Plants
Afraid this plant is quite hard to grow with standard aquarium set ups, generally they need a high level of light, meaning needs high colour spectrum usually reds & blues and Co2 (though not essential imo but helps a lot) along with the usual ferts.
Chances are in the standard set up they will grow very slowly and will probably grow or turn green rather than red (hence the need for high reds and blue lights).
Just a heads up so you are aware of what may happen with this plant, not trying to discourage you as I tried that plant myself in one of my tanks years ago which was a standard set up and not tried it again since tbh.