Calcium/Magnesium supplements - how to?

[Ray]

Originally Posted by bogdan

forgot to mention that I use RO water and once a month flush with tap water. It's very chalky, so that's one additional source of calcium.

Adding it once a month is inadequate, because as the plant grows it must have a ready supply. Most nutrients can be taken from old growth and moved to new, but calcium isn't one of those.

I actually don't even know why we are using so much RO water with them.

Because they plants have evolved to thrive on water with low dissolved solids content. If you can find the right balance of low-TDS water while providing sufficient nutrition (and that's not much) in the right proportions, many of your issues will vanish.