Actually, if this were my grow, they'd be gone... let the plant concentrate on leaves further up the stem rather than the little, beginner leaves! Just take a sharp pair of scissors that have been cleaned with rubbing alcohol and snip them close to the main stem and throw them away. They don't add much to the photosynthesis and rob the other parts of the plant of energy... and for what?!
I guess MY question is why they are showing the symptoms they are... did you have a nitrogen deficiency that you cleared up? If these leaves are on the grow you're running a diary on, just get rid of them - the plants look magnificent and these little guys are not needed...
Good luck!