Today I changed out the intakes, did some pruning, and netted out a lot of duckweed. The two middle swordplants are putting out really large leaves. A few of these were removed to let in the light. They were healthy with no algae. The Java ferns are slowly getting bigger and are looking just as I hoped. The hygrophila that seemed so slow to get started has spread out and finally was in need of a trim.
The current dose rate of unamended Flourish Comprehensive is holding iron at around 0.5 ppm. The doser dedicated to FeGLUCONATE has been decommissioned and converted to MgSO4.
So far, it is looking as though autochthonous NO3 and PO4 are not sufficient to feed the plants. I am resuming 5 seconds daily dose rate for both of these. I have not ruled out adding fish and increasing the food. Presently I believe the DOM is vanishingly small, the ORP staying at around 400 mV, with the current stream at its present adjustment. Increasing nutrient input would result in elevated autochthonous DOM, necessitating higher flow. I think I am close to striking a balance, so am reluctant to push the envelop. Still, I think the jungle can absorb a few more small tetras.