yup, i think it is mold

its starting to spread a little bit too now the other plant has like 3 spots

how do i cut it? i mean like if its just on the tip of the leaf should i cut the top half off? or if its all over a leaf where should i cut it?

and also how do i control mold? its not to humid in here but again im not trying to control the humidity or temp just yet

in my room it is about 85 on average and i keep a fan constantly blowing