Too Much Nitrate Causing Calcium Deficiency?
I recently rescaped my 60g, replacing an enormous stand of val that covered almost half the tank floor with some more swords and stem plants, and over the last few weeks I have begun to see signs of calcium deficiency (stunted, twisted growth) on my mermaid weed and all my rotalas (macranda, macranda narrow, colorata and wallichii). The ammania is just starting to look a teeny bit stunted, though not twisted yet. Everything else (8 different sword species, lagenandra, hygro corymbosa and pinnadifida, pennywort, and marsilea) is growing explosively in the new abundance of light now that the val is gone.
However, with the val gone, my nitrates have risen considerably faster than I had anticipated. Previously, they hovered around 10 or 15ppm consistently for the past year and a half, but are now closer to 80ppm (and OMG, yes, I'm going to do a water change! Two actually: one today and one tomorrow so I don't shock the poor fish. I tested today and about choked when the test tube turned red). Ammonia and nitrite are at 0, ph fell to 6 from about 6.5 previously.
Tank is dosed as follows, weekly:
45ml API Leaf Zone (potassium)
7ml Brightwell Florine-Fe
Daily 6ml API CO2 booster.
My tap is super hard, so I never needed to dose calcium before. Once the nitrates are back down, should this fix the calcium issue?