Watermelon Plant?

[Stan]

I'm growing 1 watermelon plant along with 10 tomato plants in 1 system link below.
http://www.hydroponicsonline.com/for...my-system.html
I see about 3 watermelons already starting to form on 3 different vines. Should I start clipping the rest of the vines that don't have any watyermelons forming as of yet? Should I also clip the vine that continues to grow past where the watermelons are already forming? Below is a picture of the watermelon plant from 5 days ago I will update it again sometime this coming week.