I flushed them because without the EC pen it would be like experimenting, like moving in the dark with no lights at all.....i've read at overgrow that if the plants show some kind of defficiency or have faced nute burns,then it is safe and recommended to change the water in the tank and use pH-balanced water and clean the roots of any excess that has build up there....in theory it works, in practice it really helps alot as you'll see from the pic below.....
so i guess everything turned out well once again, it just set me back a couple of days i suppose.....now i am expecting the post to deliver my new pen and and additive called cellmax superenzyme, it is meant to be helping the plants converting the dead roots into sugars....