Tomato seedling tipping over
I am having a problem with my tomato seedlings tipping over and would appreciate any feedback to help me figure out what I am doing wrong.
I start my seeds in wet paper towels in a ziplock bag and then plant the germinated seed in a 4" pot of a non fertilized seedling mix.
For the first week I leave the lights on 24 hours a day in a basement room that is around 65-70 degrees. The lights are fluorescent 6500 lumen tubes which are kept right above the plant. After a week I leave the lights on 14 hours a day.
I water with water only until the trues leaves are growing and then I use water with fertilizer in it. I add 1/2 teaspoon of all purpose Miracle Grow 15-30-15 to a gallon of water.
The tomatoes have been planted for about 4 weeks and they are between 8-10" tall, dark green, bushy tops and very healthy looking, but most of them can't support themselves and tip over.
I am wondering if I am giving them too much fertilizer and they are growing too fast with too big of tops to support? I have read that people use fans to cool the temp to help develop thicker stems, but the temp is right around 70 degrees.
I can replant them in deeper pots so that they don't tip, but I would like to figure out what I am doing wrong.