ochocinco is right under normal circumstances, you want to let the pot dry out before watering again. not completely dry but mostly dry. Unfortunately, in your case, you want to go ahead and hit them with a pretty good bit of water to try and flush some of that N out then let them sit until dry. You really need to ph your water though, and yes, ph is THE most important aspect of growing in a container. You have been luck to have made it this far with only a slight N overfeeding. You must have pretty good water or have a real good buffer in your soil.