try to upload some pictures so we can see your problem .

I heard of method when you ad pee mixed with water to ur plant because of the nut witch contains pee .

This method is not full truly . I think you need to flush out your plants but to now if you need or not , we need to now your runoff ph .

And advice . . give more information on your grow box and plants ...
humidity, temperature, soil, distance of lights to plants ...