Name: Myriophyllum aquaticum
Origin: Southern Brazil
I have this plant growing in a 95 L tall tank with one 15 W Hagen LifeGlo and one 15 W Hagen AquaGlo. I have had it a few weeks and it's growing some side shoots off the main stem already, and has new whorls starting all the time. They are growing in soft Colorado water with no CO2, in a mixture of Profile and Flourite substrate. It has a texture that forms a strong contrast to most other plants in the tank and a nice bright green color. It doesn't seem to be too difficult, but is under very strong light. It is important to keep it in your tank (out of local waterways) as it has been reported on noxious weed lists in the USA and has some forms that are apparently frost hardy.
I work at PetSmart in the aquatics department and we've had this type of milfoil (or some form of it) in some of our tanks for over a year now, and it's still going strong! Highly recommended due to its extreme hardiness and nice color. The species we have in our tanks aren't as "whispy" as the ones in the picture, in that their needles aren't as long. They look more like a shaved cabomba, either because they're older or a different species.
Most plants I have had have done very well, but this plant is an exception. I can't figure out what I do wrong, but my plants started out bright green, then the undersides of the leaves turned white and finally it simply perished. It's a hard plant indeed.
I think this plant is also called Parrots Feather. With lots of light, like in a pond sitting under the sun, it grows very thick and green. In a lower light aquarium, it'll grow, but not as green or as thick.
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