Cal deficient?

Guys 3 of the plants have started showing rust spots. Leaf tips and edges are also curling upwards and yellowing, thinking i have a calcium lockout, was useing ro til it whent bust, in bio bizz, ph 6.8, water is hard ppm around 230ppm, what you guys thinking. Calcium or k def. should i flush with distilled?.

I presume you're in soil? Try adding some calmag, start off half strength and adjust accordingly.

Flush then add a complete fertilizer

looks like the start of cal def.

Back from hydro store, got some calmag, going to flush with distilled and then the cal mag full strength