I have recently inherited a large houseplant (see below), a smaller version of which I had for several years up until last year when it finally died. My small version had been unwell for a long time and I am quite worried about this big one as it is near some orchids that I believe have shore flies and thrips (I do not think the flies will bother it but uncertain on the thrips) and the leaves are looking a bit pasty and brownish at the bottom of the plant. I would love to know what it's proper name is so that I can find out how to care for this plant and treat it better than I did it's predessesor. Also, if anyone could identify what the small one may have been afflicted with I would be very grateful: the small version had been ill for a long time, with dark brown necrosis appearing on the leaves, stems falling off, and a sticky residue over much of the foliage.
Thank you for any help!!