Just quick note, have made several changes in effort to keep these babies after reading alot on here.

Have just finished completely flushing the system, scrubed all the Algae out so none in the system. Have covered all water possible however where hoses are there will still be some light leak, maybe 1cm * 5cm worth, will this still enable algae to grow?

With the nute i went out and brought better quality called growzilla with n-p-k of 28-5-30. Added 1/6th of recomended strength as im sure was burning with the amound of nute we had. Also added Earth Juice Catalyst n=p=k of .03-.01-.10. Added 1/6th of recomnded of this too. And last things added to water (as it was recomended on back of the growzilla) was Herb's Nitrozyme and Superthrive, I used 1/6th of recomended once again.

Is there anything else people can recomend. I replaced the pads at bottems of plants as this was full of Algae, tried to wash all algae from plant, hw can you tell if it has taken hold of the actual plant? Im thinking this is whats happened with the very sick looking one, as even at the base of the plant before it hits the growing medium is green almost algae looking.

If anyone needs pics of anything let me know and il put them up for you to have a good look.

Any help much appreciated!