Mould due to Relative Humidity

Hey, found some mould on a plant in the room last week and finally got a hygrometer in that says RH is 55%. I think this could be the reason why mould formed on that plant.
Can you advise me on how to keep RH down? Or how to deal with mould?

yeah 55% RH + stagant air = possible mold growth, 55% RH + air moving all around = no mold

Cool, I don't have a desk fan in there at the moment but definitely putting one in tomorrow! Hopefully it sorts it out!

dude i feel ya had like 3 tops on my bubba kush turn mold. i have humidity at 50-60 n have bad ass ventalation. i read somewhere n belive it that it starts with the roots, good roots good resistance to stress. but as i experianced if u cut the mold out it will be back cut it all. but ne ways good luck n have a growtastic day