Cannabis Aquaponics by BrayneGro- pH discussion/ What does calcium deficiency look like?

It has been around 3 months since I talked about pH. Since then I have finally begun seeing a natural drop in my pH. That is, the plants have cleared my system of whatever amount of calcium carbonate that was buffering my pH bringing it down a full point and a half from around 7.5 down to 6.0 over the course of roughly 3 months, and the nitrifying bacterium are also doing their part in acidification. Here is a short discussion on what I will do to buffer my pH and also supplement calcium both in one fell swoop.