Green Mould

Hi, I have some seedlings growing in 4" rockwool cubes, but have noticed that the tops of the cubes are now covered in a thick slimey green mould, does anybody know a good method of killing this without harming the seedlings?

You can prevent it by keeping the cube covered from light.

Thanks for that! I allready knew but its too late now, I usually cover them when they get a little bigger, but have never had mould like this before, its actually bubbling!!!!

organic powdered milk may help. must be organic. the calcium does the trick and is nutriceous
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That green substance is not mould at all, it's algae. It won't harm your plants, cover the cubes and it won't grow bigger.