Are those brown leaves old ones? If they are..you can just trim them off. The new leaves looks quite alright to me [
] ...If you concern maybe can buy those calcium pills from pharmacy(Dunno if they sell though) or just change your brand of fertilizer to see whether other brands work. Dennerle works better but more expensive..up to you. Do take note that pH has to be slightly acidic in order for easier uptake of nutrients for the plants....too alkaline and nutrients are insoluble and cannot be taken in by plants.
Oops almost forgot..the stems of some your stem plant looks brownish..(sorry if i see wrongly)..pull one of them out and check their roots..is it rotting?
Plant Physiology by Taiz and Zeiger
Bookmarks