Thanks rusty and clandestine
I have only ferted ONCE with this 10-50-10. But now they are dead...that is for sure.
I will get some 10-10-10 or something with less amounts of P so that ferts wont burn them. Tho nute burn didnt kill them because they died even before i added the fertilizer.
These is a pic from the roots. (they dont look rotten or unhealthy to me)
http://i41.tinypic.com/2j4sjde.jpg

For the next grow:
i will get some perlite and mix 40% perlite and 60% soil mix (BTW rusty its not rice its something i cant translate correctly, but it is a part from the rice)
For the next time should i start adding the fert with high P before they start flowering?