Mold on plant

i still think that your dehum device in the tent kills the plant. The plant trys to stay wet , becauße you remove the moisture, so it just delivers more water which you remove. The leaves get ill when they do not have enough mosture during growphase, all kind of fungi can use the leafs then as a new home - becauce the plant has no chance to regulate its moisture by itself ! Touch the leafs- do they feel wet? You can use a dehumidifier - but only with a few short TIMED cycles - not on Automode. Otherwise it is "Auto-destroy". You can check your roots. But you must remove the leafs with something on it - or it will capture the rest! it is still possible to rescue it. remove all ill leafs, check your roots , and maybe add up some fresh soil and mycoriza while doing it. And then leave your plant a week repair itself (stable at 24-27°C and 58-65% hum 18H/6H) - and no ventilator directet on it!) 2-3 times just small doses of water, then nutri 2x half dose , then fulldose and you should be be back on track.