Yes, just tear them out. Use a knife if necessary but succulents are tough plants and even if you slice them out they will survive and reroot in fresh soil. To remove plants from a crowded pot first water well, slide a knife between the pot and root ball to loosen and turn pot upside down and give the rim a sharp rap. If the entire rootball does not slide out you will need to do surgery and extract the sedums with the knife. Keep growing, Marianne Binetti