I dont know what to do!? This the first problem i...

How often did you feed them bro? 3ml is a lot . You over feed them, now the only solution is to give them a good amount of water, if your using 10l pot, give them 30 litres of ph'd water so the plants can get rid of all that amount of excessive nutrients and recover. Be pacient, dont go hard, just keep adding water slowly so the soil get well washed of all that amount of nuts. Old leaves or afected ones will not recover, and you could actually take them off if they are in very bad shape, new leaves should grow green again if you do it well :) After that your soil will be clean of all nutrients and your plant will eat what's left of them on the leaves. If you still want to gave them more nutrients after this, be careful, cause your approaching harvest and you will need a very nice flush after that. You can use this as a flush and add no more nutrients, or help them now, wait a few days without any feed till the soil get dry, and then if you still have some time before harvest, just use some of your bloom nuts... Any more info just ask mate. Happy grow!!!