Still these gray spots...what are they? The plant with the red circles looks not too bad. Just let it grow. Some plants eventually grow out of their mutations. Dont give em fertilizers at this stage...just saying.
looks like water spots
/have you tried wiping them with a slightly damp soft cloth?
be sure you have good air flow going, if you decide to mist your plants so the water dosent sit on the leafs too long
as guy said, you should not be feeding them anything other than good water right now