Hydroponic tomato- plenty of flowers, no fruit,?

[Guest]

Hi, this is my son's second foray into hydroponics- he grew lettuce- a bit slow and the slugs found them- not entirely successful. He now has one tomato plant in perlite, using a standard hydroponic formula. It's growing against his bedroom window, strung up to the gutters to allow it to grow tall. It doesn't get a full day of sunlight as the 5 foot fence is 1.5m away, the tomato faces East. It looks a healthy plant and has plenty of flowers, but they eventually brown off without setting any fruit.
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