I live in Dubai United Arab Emirates. I bought a croton plant about a week and a half ago and I'm following the exact instruction: "a west side window (bright area), moist soil not soggy, temperature around 18-26 C and I'm providing enough humidity by misting the plant every 2-3 days a week, and with a tray under the plant with gravels and water." Now the lower leaves are turning pink, wilt down and then fall. Top leaves started to look creased knowing that the a central air conditioner (ac) is working all the time in the house. Do you think that the (ac) has anything to do with the problem?