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Walstad low-tech 40 B, central FL biotope, creator of Jordanella floridae x Mobula birostris hybrid
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I collected this plant from about 4-6 inches of water at the edge an airboat launch on the upper St. John's River basin 5 days ago, planted it in my 40B Walstad biotope tank (unfiltered/no CO2), and it's grown about 6 inches since. I not only don't know what it is, but... now that it's reached the glass cover of the tank, what do I do with it now? Can I trim it back below the water without killing it? Do I need to transplant it to the back wall and remove the plastic trim on the back of the cover? (I have a mollie and a couple big snails with a history of escaping...)

It's entirely possible it's not even native... because Florida.

Thanks for any help you can provide!
Flower Plant Terrestrial plant Flowering plant Pedicel
Plant Flower Organism Branch Terrestrial plant
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You were right; it doesn't belong in Florida. Pretty sure that's Alternanthera philoxeroides, aka alligator weed. Not supposed to be there, nor is it a good aquarium plant. If it's growing, it's probably only because it's trying to break the surface.
 
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