tomato plant will not fruit

[firedirt]

hello,
I have a beefsteak tomato plant indoors in a deep water setup running under a sun blaze t5 40000 lumens light 6300k bulbs running on a 12 hour cycle. The plant has lots of blossoms but can not get them to fruit. I have tried the following 1. shaking the plant 2. flicking the blossoms, oscillating fan for 30 mins. at a time. Any suggestions ?


Thanks Shaun