Yes they will be fine. Tomorrow you wont even notice anything unusual other than the one stalk being shorter. After a few days, the ut stalk will smooth over and then start to grow and in a week or two you will have another grown stalk.
Phosphates can come from many places. Do you stick your hands in your tank alot? Soap is a big cause of phosphates, dont use soap when clean your hands before putting them in the tank, just give them a good rinsing off. Another cause of phosphates could also be your water. Are you using tap water? Most city water is high in phosphates. There are plenty of items on the market that will reduce phosphates.