How to treat calcium deficiency?
So it looks like my plants are going through some calcium deficiency. I have some crypt wendtii that have cupped leaves (outside edges curled downwards and in) and very few leaves are all weirdly twisted. My argentine swords also have some leaves that are yellowing on the edges, with the very outermost portion of that becoming clear and melting away. Does this sound like calcium deficiency?
I have been dosing KNO3, K2SO4, KH2PO4, and CSM+B, as well as Flourish Comprehensive, but the only one of these that has any calcium is the Flourish, and it's probably not enough.
I just ordered a pound of CaSO4 from GLA and it will probably take 3 days to get here. I also have some Seachem Equilibrium coming in soon, but I'm reluctant to add more Mg, as that's a component of CSM+B already. Will it be fine until then or should I do something sooner? The swords are still putting out new leaves, and some of the other plants are putting out growth as well, but I'm not sure how calcium deficiency affects these things.
Also, how much CaSO4 should I be adding? It's a 55G tank, and I don't have a calcium test kit, but my GH is 6 after adding CSM+B.
Lastly, I have DIY CO2, and somehow have achieved a 1.0 pH drop only running two 2L bottles on a 55G. Should I cut this off (as well as other dosing) until I get some calcium in there, as the plants may be limited right now?