I bought this plant about a week ago and since it’s started developing small brown spots all over(it’s quite difficult to see in the photos) and at the stems of the plant it’s gone all brown. it’s also got little white speckles over the leaves, i read online about fungal, bacterial and root rot but i’m not too sure if any applies to this as it’s only just started happening. i don’t know much about house plants so i’ve came to ask what should i do? please help!!