Thanks Roarke2.0 tried the sample I took, was ok but a while to go yet, it looks like its starting to frost up now with the start of some trich's and I upped the nutes to 2.4. and she looks fine!!
The others i have have failed miserably, no root structure at all, they have been on the same regime so the only thing I can put it down to is the bubblers as dont think they are pumping enough co2 so gonna try & rescue them until the good one get the chop, then start some fresh with new bubblers!!