just had a quick look at the parrot feather and the stems seem too densly packed it just doesnt look like it. just looked at the Green Myriophyllum at it looks like that. So planted or free floating?
i put mine in the window in a tall glass full of water with some ferts in then let the roots develope before planting it just because the first time around i got fed up with re planting stems everyday untill it rooted