Notes:
I didn't mention in the aq1 section at the beginning that I trimmed the grass after cloning it, the grass that was there when I cloned them turned brown and died off, but healthy new green growth popped up from it as you can see in the results photo.
You'll notice that the big med and turkey red which are both varieties of Phalaris arundinacea tend to grow in more patchy and have the stems with the grass blades coming off, whereas the aq1 which is a Phalaris aquatica variety tends to grow more like traditional lawn grass (at least when it's kept cut back). I don't know if this generalizable to all Phalaris arundinacea and aquatica but it does appear the aquatica does a better job of filling out its pot.
Also note that my grasses have not been privileged to grow in optimal conditions for the better part of their lives. Having spent a winter rootbound in low light conditions, having been fried in the full desert sun, and just generally moved about, kicked around, and mistreated. The upside is these grasses are almost impossible to kill and continue to grow no matter what you throw at them.
They like to grow in the shade and will dry out in full sun. They seem to do fine without needing to be fertilized at all, but they very quickly become root bound in their pots and lose a bit of vigor until you either repot them in a bigger one or take clones.