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New Grower: Help Please!

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I am a relatively new grower, grown once before but this my first time with hydroponics. I have 5, 10 cm plants, in grodan 3 inch blocks.


The plants look healthy but have a very slight white discolouration on some the leaves. More disturbingly there is a white mould growing on the top of the grow block.


There are no roots showing through the block so I cannot see any roots at the moment.



Has anybody seen this before or any advice would be very much appreciated. :huh: :D ;)

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You've got what is called "white mould" When my crop was finished I used to leave the lights and fans off while they were flushing and thats when I start to get the mould so I keep the fans running now and dont have a problem with it anymore so I put the cause down to lack of adequate ventilation in a humid atmosphere. :huh:
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