well to start, you need to knock down those temps. Your digital thermometer says that its 89 and that is a little too warm. How close are your lights to the plant? What type of light are you using? What is the strength of the nutes you are using? What is the pH of the water you are using? What nutes are you using? What is your medium Hydroton or hydromite, or something else? What are your daytime and night time temps?

The troubleshooting guide is at the top of the basic growing forum, or the plant problem forum. Please answer the questions above so that we can give you better advice, but first get those temps down somewhere between 70-80 degrees.