Oh, so he is the source of your Aldros, that is nice, that is the reason why I like sharing plants with others, so that if my culture dies, and someone else has it, then I can ask for a starter culture. Sort of like a back up
Thanks for the ID, The common name is water spangles, unfortunately it is a Fern and not a monocote, I guess not going to be beneficial for Aldros as Rich suggested that Moncotes are beneficial to Aldros. Anyways do not fix that is not broken by changing what plants you have now, though you of course trim or take off some of those water spangles when they are covering too much of the water surface. I myself am trying CO2 injection, I'm desperate.
TTFN
Arvin