Oleander, Euphorbia Trigona, Boston Fern, Cyclamen, Elephant Ear, Dumb Cane, Zebra Plant, Sago Palm, ZZ Plant, Clenanthe, Jerusalem Cherry, Yucca Plant, and many other plants should be avoided indoors. Reason being, they are either insect builder, need more sunlight, inhale more CO2 than they produce O2.