I have mine under grow lights that I got at walmart and feed/water weekly per package directions for african violets and mine have started blooming beautifully since i added a room humidifier. I think what mine needed was the extra humidity.
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Maisie

I think your 15 watt tube is not giving enough light for good blooming. Most growers will use 2 40 watt tubes in their fixture. I have mine under a two tube fixture with two 40 watt bulbs, one cool white and one warm white. Standards are 10-12 inches from tube to plant top, and semis and minis are 6-8 inches, with lights on 10-12 hours a day.

In regards to watering and feeding....make up a mix of your fertilizer at 1/2 strength and use that solution every time you water. That ensures consistency in feeding.

Barbara

Hi.
I agree with what Barbara has said, just make sure your mix is light. I use a 1-1-1 mix and I wick my plants. I also wonder when you repotted your plant last. Most AV's like to be repotted every 9-12 months and 4-6 if they are minis or semis. I keep my lights on for 10 hours a day and I use 2-40W cool white tubes in my fixtures. The plants are about 12 inches away from the tubes.
Fred in NJ