Blooms are dying!

[Patrick DiFlorio]

225 gal FT
35 gal sump
4- 27gal grow beds

Ammonia 0.0ppm
Nitrite 0.0ppm
Nitrate 40ppm
pH 7.6

Grow beds are moderately full of both seedling and small plants. Tomatoes are at
A 24" height. Generally, growth looks good.

Look at the photo closely and you will see that the blooms on the squash and zucchini plants have wilted and died.
Is this because of a lack of pollination?
Or are other things happening?
This system is indoors with basic cfl lighting

Thanks in advance. BTW THANKS FOR ALL OF THE HELP THAT PEOPLE HAVE SHARED ON THIS SITE.