FTS.
Upon Joe Harvey’s (@Burr740’s) suggestion, I moved bright green plants to the corners to visually expand the width of the tank.
Eriocaulon ‘Feather Duster’ (what a weird name!) is growing thicker, and Pogostemon erectus will need trimming soon.
Tonina fluviatilis is growing slowly, but I like the new bright green stems coming out. Last time I planted T. fluviatilis, all of them melted. This new growth gives me hope.
On the other hand, I gave up hope on Cryptocoryne sp. ‘Flamingo’ which didn’t really take off.
As for Pogostemon helferi, I suspect someone is nibbling on new leaves. Could it be shrimps? Or maybe twig catfish?
Helanthium bolivianum angustifolia is thriving. As long as you keep an eye on aggressive runners, everything should be fine.