good god!!
what have you done to this thing?? okay first hand i could not tell you off hand what this is... never seen white before. explain every thing you have done since they were in seed from, including feeding ritual, nutrients, lighting/ distance of lighting,temperature, medium, anything you have done with them or the environment thus far. Even if noone knows the answer, at least they will have the maximum potential for solving your issue man, peace ~ BCbuddy