A few of my Nepenthes have red splotches/dots on the leaves. I'm worried that it might be spreading to my other nepenthes as well. Is there anything that I can buy to take care of it? Also, should I seperate these nepenthes from my others so it won't spead. I'm espeicially worried about my fusca because it was perfectly healthy before and now it seems infected. what should I do?