In article , Bill Stock
writes

What is Canadian Pond Weed? Hornwort?

Canadian Pond Weed a.k.a. Elodea
(Google comes up with pics if you're interested.)

It's not massively different to Hornwort in that it's not by any means
what you could call broad leaved (which as I understand it was your
point).

I clean mine about once a month now, but it was once a week when I had the
fine leaved/rooted plants.

Now that's more like it.
I'll do some research on the plants that you suggested.

--
Andy Slater