Medione (green planet) Is necesary to add calcium?

[Estoma]

The label doesn´t gives informacion about that element. I´m using rain water. Do you think I should add a little amount of quelated calcium? thanks!

 

[Granger2]

Yes. Good luck. -granger

 

[Estoma]

Yes. Good luck. -granger

How much do you think I should add? I wonder if 25 ppm of chelated calcium would be enough if applied every time I water de pot.