you have a lil table fan for circulating the air inside of the tent ? algae can sometimes be overwatering or lack of circulating air.
with temps and RH its about ranges not the perfect.so for me its anywhere between 17c-30c cupboard is normally 23c-27c RH goes up and down day/night just watered or not 35%-65% i dont have a humidifier or a de humidifier.
if the markings had of been just one plant id have said vareiagation,but 2 plants
thats unlikely.im rubbish at the defs/toxs game could it be mag ? lets see what a few others think
@Mañ'O'Green @woody