There's 3-4 of those Elatine hydropiper patches left out of the maybe 50-100 I planted.
I'll have to try something else with the fish I have.
Likely HC, but I'd also like to replace the Elatine triandra with something he same similar left size and shade. So the HC might go there, then the other yet to be known species will go where the EH was planned.
I might use mini Riccia. Been about 10 years since I used it.