I just got my first Hibiscus and planted it inside. It flowered for about a month and then the leaves turned yellow and fell off. On about three to four of the branches the tips are slightly covered with spider like web. I don't see any bugs on it at all, shook it for white flies and did not find any. I sprayed Sevin on it twice. I watered the soil directly at first but it stayed moist all the time and these bugs were crawling in the soil so I started watering the bottom (I have a self watering pot). The bugs went away. The leaves are seemed to be "ripped" or have irregular sides that have smooth edges. I have a sun lamp on it for a few hours a day. Please help. Thank you!!