Finally I am not-so-ashamed of the conditions in my thirty-eight, and took a full tank shot.
I did the same ferts dose this week, a bit lighter on the liquid micros, and put in root tabs. Was thinking the crypts in pots looked poorly but when I lifted one out- actually considering discarding them- saw it had roots grown out down into the substrate. So I shoved a root tab under the two, see if they can bulk up.
And here's a pic of the lovely vallisneria jungle.