Now Then Lads
Ok I think I may have over reacted slightly to the situation.
I given the girls and the set up a good inspection this morning.
The res water is clean and clear.
There is a small amount of silt at the bottom of the res which is just some remaining dust of the Hydroton Clay Pebbles which has washed through.
water PH is 6.4 whiich is ok.
Here are a couple of pics.
First pic shows the roots in question
second pic shows the slime on the feeder which I have cleaned off and found its just a slight build up due to its slight leak and not really an issue.
Other pics show the root system in the tray the pots are sat on and one of the gap in the res for access to the pump.
I will be keeping a close eye on things and will probably just cut the dead roots out to prevent any further problems.
I dont think I will need to take all the girls out now