Wedding cheesecake auto

wedding cheese cake starting to get some curling of leave might need to raise light a bit other plants seem to be doing fine and notice some yellowing and blackish spot on the bottom leaves not sure if its off spilling feed on the leaves, all plants getting feed the same so don't think its a deficiency as other 3 plants are fine but will keep close eye over this week. Made up a cal mag foliar spray as think it might be a calcuim definicy will apply and watch for improvements, slow improvements new leaves seem fine but notice other plants show calcuim definicy so going to recalibrate ph pen and up cal mag to 0.4 ec before other nutrients